Question: The 2015 Clemson Tigers football team represented Clemson University in the 2015 NCAA Division I FBS football season, ranked No. 1 throughout the College Football Playoff (CFP) rankings, Clemson defeated which team for No. 4, which football team that represented the University of Oklahoma in the 2015 NCAA Division I FBS football season, the 121st season of Sooner football?
Context: The 2008 Clemson Tigers football team represented Clemson University in the 2008 NCAA Division I FBS football season.  The Tigers were led by head coach Tommy Bowden, who resigned six games into his tenth season.  The interim head coach was assistant coach Dabo Swinney.  The Tigers play their home games in Memorial Stadium. The 2010 Clemson Tigers football team represented Clemson University in the 2010 NCAA Division I FBS football season.  The Tigers were led by head coach Dabo Swinney in his second full year and third year overall after taking over the job midway through the 2008 season.  They played their home games at Memorial Stadium and were members of the Atlantic Coast Conference in the Atlantic Division.  They finished the season 6–7, 4–4 in ACC play and were invited to the Meineke Car Care Bowl where they were defeated by South Florida, 31–26. The 2015 Oklahoma Sooners football team represented the University of Oklahoma in the 2015 NCAA Division I FBS football season, the 121st season of Sooner football.  The team was led by two-time Walter Camp Coach of the Year Award winner, Bob Stoops, in his 17th season as head coach.  They played their home games at Gaylord Family Oklahoma Memorial Stadium in Norman, Oklahoma.  They were a charter member of the Big 12 Conference. The 2015 Clemson Tigers football team represented Clemson University in the 2015 NCAA Division I FBS football season.  The Tigers were led by head coach Dabo Swinney in his seventh full year and eighth overall since taking over midway through 2008 season.  They played their home games at Memorial Stadium, also known as "Death Valley."  Clemson competed in the Atlantic Division of the Atlantic Coast Conference.  On December 5, 2015, the Tigers won the 2015 ACC Championship Game by defeating the North Carolina Tar Heels, 45–37, capping their first undefeated regular season since winning the national title in 1981.  Ranked No. 1 throughout the College Football Playoff (CFP) rankings, Clemson defeated the No. 4 Oklahoma Sooners, 37–17, in the 2015 Orange Bowl to advance to the College Football Playoff National Championship.  On January 11, 2016, the No. 2 Alabama Crimson Tide (13–1) defeated the No. 1 Clemson Tigers (14–0) in the 2016 national championship, 45–40.  Both Clemson and Alabama finished the season 14–1. The 2009 Clemson Tigers football team represented Clemson University in the 2009 NCAA Division I FBS football season.  The Tigers were led by head coach Dabo Swinney, who was in his first full season as head coach.  The Tigers played their home games in Memorial Stadium.  The Tigers won the ACC Atlantic Division, but after securing the title lost to in–state rival South Carolina in the Palmetto Bowl 34–17, before losing for the second time in the season to Georgia Tech in the ACC Championship Game.  Clemson closed the season with a win over Kentucky in the Music City Bowl. The 2015 Alabama Crimson Tide football team (variously "Alabama", "UA", "Bama", or "The Tide") represented the University of Alabama in the 2015 NCAA Division I FBS football season.  It marked the Crimson Tide's 121st overall season, 82nd as a member of the Southeastern Conference (SEC) and its 24th within the SEC Western Division.  The team played its home games at Bryant–Denny Stadium in Tuscaloosa, Alabama.  They were led by ninth-year head coach Nick Saban.  They finished the season with a record of 14 wins and 1 loss (14–1 overall, 7–1 in the SEC), as SEC champions and as consensus national champions after they defeated Clemson in the College Football Playoff (CFP) National Championship Game.  Alabama also secured its 10th Associated Press (AP) national title. The 2013 Clemson Tigers football team represented Clemson University in the 2013 NCAA Division I FBS football season.  The Tigers were led by head coach Dabo Swinney in his fifth full year and sixth overall since taking over midway through 2008 season.  They played their home games at Memorial Stadium, also known as "Death Valley".  They were members of the Atlantic Division of the Atlantic Coast Conference.  They finished the season 11–2, 7–1 in ACC play to finish in second place in the Atlantic Division.  They were invited to the Orange Bowl where they defeated Ohio State. The 2014 Clemson Tigers football team represented Clemson University in the 2014 NCAA Division I FBS football season.  The Tigers were led by head coach Dabo Swinney in his sixth full year and seventh overall since taking over midway through 2008 season.  They played their home games at Memorial Stadium, also known as "Death Valley."  They were members of the Atlantic Division of the Atlantic Coast Conference.  They finished the season 10–3, 6–2 in ACC play to finish in second place in the Atlantic Division.  They were invited to the Russell Athletic Bowl where they defeated Oklahoma. The 2012 Clemson Tigers football team represented Clemson University in the 2012 NCAA Division I FBS football season.  The Tigers were led by head coach Dabo Swinney in his fourth full year and fifth overall since taking over midway through 2008 season.  They played their home games at Memorial Stadium, also known as "Death Valley".  They were members of the Atlantic Division of the Atlantic Coast Conference.  On November 10, Clemson set a school record with their 12th straight home win at Death Valley.  They finished the season 11–2, 7–1 in ACC play to be Atlantic Division co–champions with Florida State.  Due to their loss to Florida State, they did not represent the division the ACC Championship Game.  They were invited to the Chick-fil-A Bowl where they defeated LSU.  The Tigers had their first 11-win season since 1981. The 2016 Clemson Tigers football team represented Clemson University in the 2016 NCAA Division I FBS football season.  The Tigers were led by head coach Dabo Swinney in his eighth full year and ninth overall since taking over midway through 2008 season.  They played their home games at Memorial Stadium, also known as "Death Valley", and competed in the Atlantic Division of the Atlantic Coast Conference.  The Tigers entered the 2016 season after a 14–1 record and as finalists in the CFP National Championship game for the 2015 season.
Answer: 2015 Oklahoma Sooners football team