Question: Mian Muhammad Nawaz Sharif (Urdu/Punjabi: myN mHmd nwz shryf, born 25 December 1949) is a Pakistani businessman and politician who served as the Prime Minister of Pakistan from 2013 until he was disqualified for life from office by the Supreme Court of Pakistan in 2017. He had previously served as the Prime Minister twice in the 90s (1990-93 and 1997-99) and the Chief Minister of Punjab from 1985 to 1990. He is Pakistan's longest-serving prime minister. Born into the upper-middle class Sharif family in Lahore, he is the son of Ittefaq and Sharif Group founder, Muhammad Sharif, and the elder-brother of three-time elected Punjab Chief Minister, Shehbaz.

On 7 November 1990, the newly elected prime minister announced his nuclear policy and in public television, Sharif responded that: "The peaceful [atomic] programme of which... it would be accelerated to accommodate growing [nuclear] [e]nergy needs and to make up for rising [oil] prices. And, of course, (Pakistan) will to construct new nuclear power plants." On 26 November, Sharif authorised talks with the US to solve the nuclear crises after the US had tightened its embargo on Pakistan, prompting Sharif to send his government's Treasure Minister Sartaj Aziz to held talks on Washington. It was widely reported in Pakistan that the US Assistant Secretary of State Teresita Schaffer had told the Foreign Minister Shahabzada Yaqub Khan to halt the uranium enrichment programme.  In December, France's Commissariat a l'energie atomique agreed to provide a commercial 900MW power plant, but plans did not materialise as France wanted Pakistan to provide entire financial funds for the plant. On December, the financial embargo was placed and the country's economy felt a distress that prompted Sharif to replace his Treasure minister. Sharif then used Munir Ahmad Khan to have convinced IAEA to allow Pakistan for a nuclear plant in Chashman where Khan intensively lobbied in IAEA for the nuclear power plant. In December 1990, IAEA allowed Pakistan to established CHASNUPP-I, signed with China; the IAEA also gave approval of upgrading of the KANUPP-I in 1990. During his first term, Sharif intensified his non-nuclear weapon policy and strictly followed the policy of deliberate nuclear ambiguity which was also continued by Benazir as well. Responding to US embargo, Sharif publicly announced that: "Pakistan possessed no [atomic] bomb... Pakistan would be happy to sign the Nuclear Nonproliferation Treaty (NPT) but it must be provided "first" to India to do the same."  Sharif intensified his move to enhance the Pakistan's integrated nuclear development and authorised projects that seemed to be important in his point of views. Sharif also promoted the peaceful nuclear energy programme, and signed the CHASNUPP-I reactor with People's Republic of China for the commercial electricity use. Sharif also responded to use the nuclear development in more of economical usage, benefited for the country's economy and its extension to the civil society. His policies to make the nuclear program for economical use was also continued by Benazir Bhutto and Pervez Musharraf.

Using a quote from the above article, answer the following question: What was his biggest success?
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Answer: Sharif also promoted the peaceful nuclear energy programme,

Problem: Chicago is an American rock band formed in 1967 in Chicago, Illinois as The Chicago Transit Authority before shortening the name in 1970. The self-described "rock and roll band with horns" began as a politically charged, sometimes experimental, rock band and later moved to a predominantly softer sound, generating several hit ballads. The group had a steady stream of hits throughout the 1970s and 1980s. Since at least 2008, Billboard has shown Chicago to be the "greatest of all time" American band in singles chart success, and since 2015, the "greatest of all time" American band in album chart success as well.

Concurrently with Chicago's existing career, lead vocalist Peter Cetera had begun a solo career. He proposed an arrangement with the band where they would take hiatuses after tours to let him focus on solo work (mirroring that of Phil Collins and Genesis), but the band declined. Cetera ultimately left Chicago in the summer of 1985. He soon topped the charts with "Glory of Love" (the theme song of the film The Karate Kid Part II), and with "The Next Time I Fall" (a duet with Amy Grant). Two more songs reached the Top Ten: a 1988 solo hit called "One Good Woman" (No. 4 U.S.), and a 1989 duet with Cher called "After All" (No. 6 U.S.). In 1992, Cetera released his fourth studio album, World Falling Down, which earned him three hits on the Adult Contemporary charts, including the single "Restless Heart". Cetera's former position was filled by bassist and singer-songwriter Jason Scheff, son of Elvis Presley's bassist Jerry Scheff. Guitarist Chris Pinnick also left the group prior to the recording of the band's next album.  For the final Foster-produced album, Chicago 18, the band filled Pinnick's spot with several session guitarists, none of whom became band members. The album was released on September 29, 1986, and included the No. 3 single "Will You Still Love Me?", and Top 20 Pop song "If She Would Have Been Faithful...", in addition to an updated version of "25 or 6 to 4" with a video that got airplay on MTV. Soon after the album was recorded, the band hired guitarist Dawayne Bailey, formerly of Bob Seger's Silver Bullet Band. Bailey and Scheff had previously played in bands together, so Scheff introduced Bailey to the band in time for the Chicago 18 tour.  For the 1988 release, Chicago 19, the band had replaced producer Foster with co-producers Ron Nevison, who had recently produced two albums for Heart, and Chas Sanford, who had worked with Rod Stewart and Stevie Nicks. They topped the charts again with the Diane Warren-composed single "Look Away". It was the third and last Chicago single to reach No. 1 on the Hot 100 chart. The song ultimately was named as the "Billboard Hot 100 No. 1 Song of the Year" for 1989. The album also yielded two more Top 10 hits, "I Don't Wanna Live Without Your Love" and "You're Not Alone", both with Champlin singing solo lead for the first time, and the Scheff-sung No. 55 single, "We Can Last Forever," in addition to including the original version of a Top 5 single titled "What Kind Of Man Would I Be?". The latter, also sung by Scheff, was remixed for inclusion on the band's forthcoming greatest hits record (and 20th album), Greatest Hits 1982-1989, and it was this version that became a hit.

What year did Peter Cetera leave Chicago?

Answer with quotes:
Cetera ultimately left Chicago in the summer of 1985.