Input question: Who did the then Cassius Clay defeat to win the heavyweight boxing championship of the world in 1964?

Output answer: sonny liston

Input question: A bonspiel is a tournament in which winter sport?

Output answer: curling

Input question: Lake Vanern is the largest lake in which country?

Output answer: sweden

Input question: In the US, which state borders the south of Kansas?

Output answer:
oklahoma