TASK DEFINITION: Given a factoid/trivia type question, generate the topic of the question. The topic is the entity the question talks about.
PROBLEM: Where is David Cameron's Oxfordshire constituency?

SOLUTION: david cameron

PROBLEM: Auld Reekie is the nickname for which Scottish city?

SOLUTION: auld reekie

PROBLEM: Who plays the part of Mrs Brown in the TV comedy Mrs Brown's Boys?

SOLUTION:
mrs. brown's boys