TASK DEFINITION: Given a factoid/trivia type question, generate the topic of the question. The topic is the entity the question talks about.
PROBLEM: In which famous film did Michael Caine play a character named Charlie Croker?

SOLUTION: charlie croker

PROBLEM: Who was re-elected Prime Minister of Canada in May 2011?

SOLUTION: prime minister of canada

PROBLEM: Dave Brock has been leader of which psychedelic rock group for over 40 years?

SOLUTION:
dave brock