TASK DEFINITION: You are given a concept, and a list of answers. You should generate a question about the concept that leads to the given answer(s).
PROBLEM: concept: Sammy Hagar  answers:  ['Rock music', 'Hard rock', 'Heavy metal']

SOLUTION: what does sammy hagar sing?

PROBLEM: concept: Tom Cruise  answers:  ['Billy']

SOLUTION: what role did tom cruise play in endless love?

PROBLEM: concept: Charlemagne  answers:  ['Fastrada', 'Luitgard', 'Hildegard of Savoy', 'Desiderata of the Lombards', 'Himiltrude']

SOLUTION:
who was charlemagne's wife?