Question: Kelvin Matthew Sampson was a head coach of a men's basketball team that plays in what conference?
Context: The Oklahoma Sooners men's basketball team represents the University of Oklahoma in men's NCAA Division I basketball.  The Sooners play in the Big 12 Conference. The 2014–15 Houston Cougars men's basketball team represented the University of Houston during the 2014–15 NCAA Division I men's basketball season.  It was their first season under head coach Kelvin Sampson and second as members of the American Athletic Conference.  The Cougars’ home arena was the on-campus Hofheinz Pavilion.  Their record was 13–19, and 4–14 in conference play to finish in tenth place.  They advanced to the quarterfinals of the 2015 American Conference Tournament, where they lost to Tulsa. The 2001–02 Oklahoma Sooners men's basketball team represented the University of Oklahoma.  The Head Coach was Kelvin Sampson.  The team played its home games in the Lloyd Noble Center and was a member of the Big 12 Conference. Kelvin Matthew Sampson (born October 5, 1955) is an American basketball coach who is currently the head coach of the Houston Cougars men's basketball team.  He was a head coach at Montana Tech from 1981 to 1985, Washington State University from 1987 to 1994, the University of Oklahoma from 1994 to 2006, and Indiana University 2006 to 2008.  He has also been an assistant coach for several NBA teams including the Milwaukee Bucks and Houston Rockets. The 2007–08 Indiana Hoosiers men's basketball team represented Indiana University during the 2007-08 NCAA Division I men's basketball season.  Indiana was a member of the Big Ten Conference.  They played their home games in Assembly Hall in Bloomington, Indiana.  The interim head coach at the end of the season was Dan Dakich.  Indiana University announced on February 22, 2008, that Kelvin Sampson accepted a $750,000 buyout of his contract and resigned as the Indiana University men’s basketball coach. The 2015–16 Houston Cougars men's basketball team represented the University of Houston during the 2015–16 NCAA Division I men's basketball season.  The Cougars were led by second year head coach Kelvin Sampson and were members of the American Athletic Conference.  The Cougars played their home games at Hofheinz Pavilion.  They finished the season with a record of 22–11, 12–6 in AAC play to finish in a tie for third place in conference.  They lost in the quarterfinals of the AAC Tournament to Tulane.  They received a bid to the National Invitation Tournament where they lost to Georgia Tech in the first round. Phillip Reginald "Reggie" Witherspoon (born February 21, 1961) is the head coach of the Canisius College men's basketball team and the former head coach of the University at Buffalo men's college basketball team.  He was fired after the 2012-13 season.  He was the head coach at Erie Community College, and head coach and assistant coach at Sweet Home High School before he was hired as the interim head coach at Buffalo in December 1999.  Witherspoon was named full-time head coach on March 10, 2000.  He was the first African American named head coach of a varsity sports team in any Western New York suburban school district.  Witherspoon served one season as an assistant at Alabama under head coach Anthony Grant.  In 2015, Witherspoon was let go by Alabama when Grant was replaced by Avery Johnson.  He was subsequently named as an assistant on Matt McCall's staff at UT-Chattanooga. The 2017–18 Houston Cougars men's basketball team will represent the University of Houston during the 2017–18 NCAA Division I men's basketball season.  The Cougars will be led by fourth-year head coach Kelvin Sampson as members of the American Athletic Conference.  Due to renovations to the Cougars home arena, Hofheinz Pavilion, the Cougars will play their home games in the Toyota Center. The 2006–07 Indiana Hoosiers men's basketball team represented Indiana University in the 2006–07 college basketball season.  Their head coach was Kelvin Sampson, in his first season with the Hoosiers.  Sampson, formerly at Oklahoma was hired on March 29, 2006 to replace the recently resigned Mike Davis.  The team played its home games at Assembly Hall in Bloomington, Indiana, and was a member of the Big Ten Conference. The 2016–17 Houston Cougars men's basketball team represented the University of Houston during the 2016–17 NCAA Division I men's basketball season.  The Cougars were led by third-year head coach Kelvin Sampson and were members of the American Athletic Conference.  The Cougars played their home games at Hofheinz Pavilion.  They finished the season 21–11, 12–6 in AAC play to finish in third place.  They lost to Connecticut in the quarterfinals of the AAC Tournament.  They received an at-large bid to the National Invitation Tournament as a No. 2 seed and lost in the first round to Akron.
Answer: Big 12 Conference