Question: Who was the winning coach in the 2009 Big 12 Championship Game?

full_context: Document 1: 2009 Nebraska Cornhuskers football team: The 2009 Nebraska Cornhuskers football team represented the University of Nebraska–Lincoln in the 2009 NCAA Division I FBS football season. The Cornhuskers played their home games at Memorial Stadium in Lincoln, Nebraska and were led by head coach Bo Pelini. The Cornhuskers finished the season 10–4, 6–3 in Big 12 and were Big 12 North Division champions and represented the division in the Big 12 Championship Game, where they lost to Texas 13–12. Nebraska was invited to the Holiday Bowl, where they defeated Arizona 33–0.
Document 2: Texas Longhorns football under Mack Brown: William Mack Brown (born August 27, 1951) is the former head coach of the University of Texas Longhorn football team. Through 2008 the Texas Longhorns football team under Mack Brown have had a winning season for all eleven seasons since Brown took over the program for the 1998 season. As of 2008, they have won at least ten games in each of the past eight seasons; that is the longest active streak in the nation.
Document 3: 1997 Texas Longhorns football team: The 1997 Texas Longhorns football team represented the University of Texas at Austin during the 1997 NCAA Division I-A football season. They were represented in the Big 12 Conference in the South Division. They played their home games at Darrell K Royal–Texas Memorial Stadium in Austin, Texas. The team was led by head coach John Mackovic, who was fired after the conclusion of the regular season.
Document 4: 2006 Big 12 Championship Game: The 2006 Dr. Pepper Big 12 Championship Game was held on December 2, 2006 at Arrowhead Stadium in Kansas City, Missouri, and pit the divisional winners from the Big 12 Conference: the Nebraska Cornhuskers, winner of the North division against the Oklahoma Sooners, winner of the South division. The Sooners defeated the Cornhuskers, 21-7. This was the first time the two teams had ever met in the Big 12 conference championship game.
Document 5: 2009 Texas Longhorns football team: The 2009 Texas Longhorn football team (variously "Texas" or "UT" or the "Horns") represented the University of Texas at Austin in the 2009 NCAA Division I FBS football season. The team was coached by Mack Brown. Texas played their home games in Darrell K Royal–Texas Memorial Stadium.
Document 6: 2014 Nebraska Cornhuskers football team: The 2014 Nebraska Cornhuskers football team represented the University of Nebraska in the 2014 NCAA Division I FBS football season. The team was coached by Bo Pelini and played their home games at Memorial Stadium in Lincoln, Nebraska. They were members of the West Division of the Big Ten Conference. They finished the season 9–4, 5–3 in Big Ten play to finish in a tie for second place in the West Division. Following losses to both Wisconsin and Minnesota and a come from behind win in overtime at Iowa, Pelini was relieved of his coaching duties following the conclusion of the regular season on November 30, 2014. On December 4, 2014, Mike Riley was announced as the next head coach of the Nebraska football team, and would begin his duties immediately. However, he would not coach the Huskers in the Holiday Bowl, with that job instead handled by Barney Cotton. The Cornhuskers lost the Holiday Bowl to USC.
Document 7: 1996 Texas Longhorns football team: The 1996 Texas Longhorns football team represented the University of Texas at Austin during the 1996 NCAA Division I-A football season. They were represented in the Big 12 Conference in the South Division in its first season in existence. They played their home games at Darrell K Royal–Texas Memorial Stadium in Austin, Texas. The team was led by head coach John Mackovic.
Document 8: 2010 Texas Longhorns football team: The 2010 Texas Longhorns football team (variously "Texas", "UT", the "Longhorns", or the "'Horns") represented the University of Texas at Austin in the 2010 NCAA Division I FBS football season. The team was coached by Mack Brown, in his 13th year at Texas. Longhorns played their home games in Darrell K Royal–Texas Memorial Stadium and are members of the south division of the Big 12 Conference. Texas finished the season 5–7, 2–6 in Big 12 play. It was the Longhorns' first losing season since 1997.
Document 9: 2010 Nebraska Cornhuskers football team: The 2010 Nebraska Cornhuskers football team represented the University of Nebraska in the 2010 NCAA Division I FBS football season. The team was coached by Bo Pelini and played their home games at Memorial Stadium in Lincoln, Nebraska. They were members of the North Division of the Big 12 Conference. It was Nebraska's 102nd and last season in the Big 12 (including years in the MVIAA/Big Eight) as they will begin competing in the Big Ten Conference in 2011.
Document 10: 2009 Big 12 Championship Game: The 2009 Dr Pepper Big 12 Championship Game was held on December 5, 2009 at Cowboys Stadium in Arlington, Texas. The divisional winners from the Big 12 Conference squared off in the 14th edition of the game. The Texas Longhorns represented the South Division and the Nebraska Cornhuskers represented the North. Texas won 13–12 on a last second field goal by placekicker Hunter Lawrence.
Document 11: 2011 Texas Longhorns football team: The 2011 Texas Longhorns football team (variously "Texas," "UT," the "Longhorns," or the "'Horns") represented the University of Texas at Austin in the 2011 NCAA Division I FBS football season. The Longhorns were led by 14th year head coach Mack Brown and played their home games at Darrell K Royal–Texas Memorial Stadium. They are a member of the Big 12 Conference. They finished the season 8–5, 4–5 in Big 12 play to finish in a tie for sixth place improving on their disastrous 5-7 season from 2010. They were invited to the Holiday Bowl where they defeated California 21–10.
Document 12: 2010 Big 12 Championship Game: The 2010 Big 12 Championship Game was played at 7:00 p.m. on Saturday, December 4, 2010, at AT&T Stadium, then known as Cowboys Stadium, in Arlington, Texas to determine the 2010 football champion of the Big 12 Conference. At that time, it was the final championship game for the conference as two members of the Big 12 had announced their intentions to leave the conference. The South Division was represented by Oklahoma and the North Division was represented by Nebraska. Oklahoma defeated Nebraska 23-20 to win the final Big 12 Championship and claim their seventh Big 12 Title. It was Oklahoma's eighth appearance in the game.
Document 13: 2005 Texas Longhorns football team: The 2005 Texas Longhorns football team represented the University of Texas at Austin during the 2005 NCAA Division I-A football season, winning the Big 12 Conference championship and the national championship. The team was coached by Mack Brown, led on offense by quarterback Vince Young, and played its home games at Darrell K. Royal – Texas Memorial Stadium.
Document 14: 2011 Nebraska Cornhuskers football team: The 2011 Nebraska Cornhuskers football team represented the University of Nebraska–Lincoln in the 2011 NCAA Division I FBS football season. The Cornhuskers were coached by Bo Pelini and played their home games at Memorial Stadium in Lincoln, Nebraska. This season was Nebraska's first in the Big Ten Conference in the Legends Division as they moved from the Big 12 Conference to the Big Ten following the conclusion of the 2010 season. They finished the season 9–4, 5–3 in Big Ten play to finish in third place in the Legends Division. They were invited to the Capital One Bowl where they were defeated by South Carolina 13–30.
Document 15: 2012 Nebraska Cornhuskers football team: The 2012 Nebraska Cornhuskers football team represented the University of Nebraska in the 2012 NCAA Division I FBS football season. The team was coached by Bo Pelini and played their home games at Memorial Stadium in Lincoln, Nebraska. The Cornhuskers finished with 10–4 overall, 7–1 Legends, to become Big Ten Legends Division champions. In the postseason, the team was invited to their first 2012 Big Ten Football Championship Game, where they lost to Wisconsin, and lost to Georgia in the 2013 Capital One Bowl.
ground_truth: Mack Brown