Where did the first openly gay football player drafted in the NFL play college football?
University of Missouri
Title: Homosexuality in American football
Passage: Few American football players have come out as gay.  Six former National Football League (NFL) players have come out publicly after they retired.  There has never been anyone who has been publicly out while playing in the NFL.  Michael Sam was selected by the St. Louis Rams in 2014 NFL Draft, and became the first publicly gay player drafted in the league, but was released before the start of the regular season.  He became the first publicly gay player to play in the Canadian Football League in August 2015.  In college football, Division III player Conner Mertens came out as bisexual in January 2014, becoming the first active college football player at any level to publicly come out.  In August 2014, Arizona State player Chip Sarafin became the first publicly out active Division I player.
Title: Ryan O'Callaghan
Passage: Ryan Thomas O'Callaghan (born July 19, 1983) is a former American football offensive tackle.  He played college football at California and was drafted by the New England Patriots in the fifth round of the 2006 NFL Draft.  He also played for the Kansas City Chiefs.  O'Callaghan is one of only a few openly gay former NFL players.
Title: Michael Sam
Passage: Michael Alan Sam, Jr. (born January 7, 1990) is a former American football defensive end.  He played college football for the University of Missouri and was drafted by the St. Louis Rams of the National Football League (NFL) in the seventh round of the 2014 NFL draft.
Michael Sam Homosexuality in American football