Question: Who won the men's college basketball championship last year?

Disambiguated questions and answers:
context: No context provided
question: What team won the 2017 NCAA Championship?
short_answers: North Carolina

context: No context provided
question: What team won the 2016 NCAA Championship?
short_answers: Villanova

context: No context provided
question: What team won the 2015 NCAA Championship?
short_answers: Duke

context: No context provided
question: What head coach won the 2017 NCAA Championship?
short_answers: Roy Williams

context: No context provided
question: What head coach won the 2016 NCAA Championship?
short_answers: Jay Wright

context: No context provided
question: What head coach won the 2015 NCAA Championship?
short_answers: Mike Krzyzewski

Long answers:
knowledge: content: The National Collegiate Athletic Association (NCAA) Division I Men's Basketball Tournament is a single-elimination tournament for men's college basketball teams in the United States. It determines the champion of Division I, the top level of play in the NCAA,[1] and the media often describes the winner as the national champion of college basketball.
wikipage: List of NCAA Division I men's basketball champions

content: Michael William Krzyzewski (/ʃɪˈʒɛfski/ shih-ZHEF-skee;[1] nicknamed "Coach K"; born February 13, 1947) is the head men's basketball coach at Duke University, where, since 1980, he has led the Blue Devils to five NCAA Division I titles, 12 Final Fours, 15 ACC Men's Basketball Tournament championships, and 12 ACC regular season titles.
wikipage: Mike Krzyzewski

content: On April 6, 2015, Krzyzewski won his 5th NCAA championship, when Duke defeated Wisconsin in the title game.
wikipage: Mike Krzyzewski

content: Wright has led the Villanova Wildcats to six Big East Conference championships and 14 NCAA Tournament appearances in his 19 seasons as head coach. Wright took Villanova to the Final Four in 2009. Wright then led Villanova to the 2016 NCAA Championship, defeating North Carolina, and the 2018 NCAA Championship, defeating Michigan.
wikipage: Jay Wright (basketball)

content: Williams won his third national championship on April 3, 2017, when he led the Tar Heels to victory against the Gonzaga Bulldogs. Williams is one of six NCAA Men's Division I college basketball coaches to have won at least three national championships.
wikipage: Roy Williams (basketball coach)
long_answer: The National Collegiate Athletic Association Division I Men's Basketball Tournament is a single-elimination tournament for men's college basketball teams in the United States which determines the champion of Division I, the top level of play in the NCAA. In 2015, the tournament was won by Duke, led by coach Mike Krzyzewski, has led the team to five NCAA Division I titles, 12 Final Fours, 15 ACC Men's Basketball Tournament championships, and 12 ACC regular season titles. In 2016, Villanova won the championship, led by coach Jay Wright, who led the team to a total of 14 NCAA Tournament appearances in his 19 seasons as head coach and also helped them win the 2018 NCAA Championship. In 2017, North Carolina won the championship, led by coach Roy Williams, who is one of six NCAA Men's Division I college basketball coaches to have won at least three national championships.