Background: Jahlil Okafor (pronounced ; born December 15, 1995) is an American professional basketball player for the Brooklyn Nets of the National Basketball Association (NBA). He played his freshman season of college for the 2014-15 Duke national championship team. Okafor was heavily recruited since before high school and had been at the top of the recruiting rankings for several years. He played high school basketball in Chicago, Illinois for Whitney M. Young Magnet High School, where he earned high school national player of the year awards from McDonald's, USA Today and Parade.
Context: In June 2012, Sports Illustrated named him one of their "Future Game Changers", a group of fourteen young athletes who are considered to be the brightest talents of their respective sport (such as Sarah Hendrickson, Jabrill Peppers, and Taylor Townsend). On September 19 John Calipari made Okafor an offer to play for Kentucky, joining Ohio State, Michigan State, Louisville, Illinois, Duke, North Carolina, Florida and Arizona as programs that have offered Okafor.  Okafor was one of 10 USA Today preseason All-USA selections (along with Aaron Gordon, Andrew Harrison, Aaron Harrison, Kasey Hill, Jones, Parker, Julius Randle, Noah Vonleh, Andrew Wiggins). Okafor was named as one of the top 5 Illinois Mr. Basketball contenders (along with Parker, Kendrick Nunn, Sterling Brown and Malcolm Hill) prior to the season by the Chicago Tribune's Mike Helfgot. Whitney Young was the number eight ranked team in the MaxPreps.com national preseason poll. Young entered the season ranked fourteenth in the nation according to ESPN.  On December 20 Okafor and Young lost in overtime to Dakari Johnson's ESPN #1-ranked Montverde Academy. Young was ranked #9 at the time. On January 19, Okafor led Young to an 85-52 victory over Long Beach Polytechnic High School at the Hoophall Classic with 26 points, 7 rebounds and 3 blocks. The victory gave Young a 7-1 record against nationally ranked teams for the year, moving Young to #2 in the USA Today rankings as they prepared for the January 26 crosstown showdown against Simeon and Parker.  In the Chicago Public High School League playoffs February 15 finals contest against Morgan Park High School Okafor tallied 19 points, 14 rebounds and 7 blocked shots, including a game-saving block against Billy Garrett, Jr., in a 60-56 overtime Public League Championship game victory over Morgan Park.  Okafor was recognized as a 2013 All-Public League first team selection by the Chicago Sun-Times along with Nunn, Parker, Alexander and Billy Garrett, Jr. On February 28, he was named the Chicago Sun-Times Player of the Year. On March 25, Okafor finished as runner-up in the Illinois Mr. Basketball voting to Parker by a 315-277-point margin, including a 43-40 first place vote margin. On April 17, he was a first team All-USA selection by USA Today along with Wiggins, Aaron Harrison, Randle and Parker. Following the demise of ESPN HS, HighSchoolHardwood.com undertook several honoraria selections. Although MaxPreps.com did not select him as a first team All-American, they did select him as a Junior All-American along with Stanley Johnson, Joel Berry, Jones, and Emmanuel Mudiay.
Question: Why did they give him this honor?
Answer: athletes who are considered to be the brightest talents of their respective sport (

Problem: Background: Serebro (Russian: Serebro; English translation: Silver) (Stylized as SEREBRO) is a Russian girl group formed by their manager and producer Maxim Fadeev.
Context: Polina Favorskaya (Russian: Polina Favorskaia, born 21 November 1991 in Volgograd, Russia) was the replacement of Elena Temnikova, who was introduced 5 June 2014. Favorskaya announced she was leaving the group in August 2017, but continued performing with them until the end of 2017.  Anastasia Karpova (Russian: Anastasiia Karpova, born 2 November 1984 in Balakovo, Russia) was very interested in music since her early age, but dedicated herself to ballet. She was also attending singing classes and decided to pursue her singing career. Anastasia had replaced Lizorkina, after the latter announced her departure. She first had her debut with the group on their single "Like Mary Warner". Anastasia, along with Elena and Olga had recorded their second studio album Mama Lover, making it Karpova's first full-length studio album. Karpova decided to leave the group to pursue a solo career. The song "UGAR" was her last song with the group.  Marina Lizorkina (Russian: Marina Lizorkina, born 9 June 1983 in Moscow, Russia) entered the Contemporary Art University in Moscow at the age of sixteen. She used to sing in a choir, before she became the lead singer of the group "Formula". In 2004, they released a few singles for the series Obrechennaya Stat Zvezdoy. Lizorkina was the last to join Serebro, after she saw an Internet announcement.  Dasha Shashina (Russian: Dasha Shashina, born 1 September 1990 in Nizhny Novgorod, Russia) is the replacement of Anastasia Karpova, who began performing with the group in October 2013. Shashina left the group in March 2016 due to serious health issues and having to undergo two surgeries.  Elena Temnikova (Russian: Elena Temnikova, born 18 April 1985 in Kurgan, Russia) came to media prominence as a contestant on the Channel One talent show Star Factory in 2003. She was spotted by Maxim Fadeev, the main producer of Star Factory, and signed to his recording company Monolit Records. Although Temnikova released two disco singles, "Begi" and "Taina", she did not continue her solo career and joined Serebro instead. She married co-member of Star Factory Alexey Semenov; the two separated in 2007, before a settlement for divorce. She then had a brief conflict with Fedeev, after dating and subsequently leaving his brother. She currently resides in Moscow, Russia. On 15 May 2014 the official Serebro website reported that Elena had left the group due to ill health. She was replaced with Karpova who had left the band earlier the previous year until they find a replacement.
Question: What is Polina's birthdate?
Answer:
born 21 November 1991