TASK DEFINITION: Given a factoid/trivia type question, generate the topic of the question. The topic is the entity the question talks about.
PROBLEM: To which actress is Daniel Craig married?

SOLUTION: daniel craig

PROBLEM: Brothers Richard and Simon Mantell played which sport for England in the 2010 Commonwealth Games?

SOLUTION: 2010 commonwealth games

PROBLEM: For which 1988 a cappella song is Bobby McFerrin best known ?

SOLUTION:
bobby mcferrin