Question: what was the nationality of a boxer who was managed by Cedric Kushner and born in 7 January 1966?

Context paragraphs:
Cedric Kushner: Cedric Kushner (July 18, 1948 – January 29, 2015) was a South African-born American boxing promoter and manager.  In the late 1990s he was one of the most significant promoters in the sport.  Boxers he promoted and/or managed included Hasim Rahman, Shannon Briggs, Oleg Maskaev, Chris Byrd, Corrie Sanders, Ike Ibeabuchi and David Tua.

Claudia Sonn: Claudia Sonn (born 7 January 1966) is a German women's international footballer who plays as a midfielder.  She is a member of the Germany women's national football team.  She was part of the team at the 1989 European Competition for Women's Football.

Hannah Smith (supercentenarian): Hannah Smith (7 January 1856 – 10 January 1966) was born in Salford, England and lived to become a British supercentenarian and the oldest recognised living person in the world.

Mohamed El-Azoul: Mohamed El-Azoul (born 7 January 1966) is an Egyptian swimmer.  He competed at the 1988 Summer Olympics and the 1992 Summer Olympics.

Jorge Mendes: Jorge Paulo Agostinho Mendes (born 7 January 1966), better known simply as Jorge Mendes, is a Portuguese football agent.  He is registered with the Portuguese Football Federation and heads the GestiFute company, founded in 1996.  Mendes is among the most influential football agents in the world, with clients including Cristiano Ronaldo, David de Gea, Diego Costa, James Rodríguez, and José Mourinho.  Mendes is often referred to as a "super-agent".

Pearls of the Deep: Pearls of the Deep (Czech: Perličky na dně ) is a 1966 Czechoslovak anthology film directed by Jiří Menzel, Jan Němec, Evald Schorm, Věra Chytilová and Jaromil Jireš.  The five segments are all based on short stories by Bohumil Hrabal.  The film was released in Czechoslovakia on 7 January 1966.

Heiko Scholz: Heiko Scholz (born 7 January 1966) is a German former footballer who is now manager of Lokomotive Leipzig.

Corrie Sanders: Cornelius Johannes "Corrie" Sanders (7 January 1966 – 23 September 2012) was a South African professional boxer who competed from 1989 to 2008.  He won the WBO heavyweight title in 2003 after stopping Wladimir Klitschko in two rounds, which was considered one of the biggest upsets in heavyweight boxing history; "The Ring" magazine named it the Upset of the Year.  In 2004, having vacated the WBO title, Sanders faced Wladimir's brother Vitali Klitschko in an unsuccessful challenge for the vacant WBC and "Ring" heavyweight titles.

Iris Plotzitzka: Iris Plotzitzka (born 7 January 1966 in Memmingen, Bavaria) is a retired West German shot putter.

Five O'Clock World: "Five O'Clock World" (also known as "5 O'Clock World") is a song written by Allen Reynolds and recorded by American vocal group The Vogues.  It reached number 1 on WLS on 17 December 1965 and 7 January 1966, number 1 in Canada on the "RPM" singles chart on 10 January 1966 (their first of two chart-toppers there that year, followed by "Magic Town" in April), and number 4 in the U.S. on the Hot 100 on 15–22 January 1966 and is one of The Vogues' best-known hits, along with "You're The One".

Supporting paragraphs: Cedric Kushner Corrie Sanders
Answer: South African