TASK DEFINITION: Given a factoid/trivia type question, generate the topic of the question. The topic is the entity the question talks about.
PROBLEM: What horse won the 2009 Grand National?

SOLUTION: 2009 grand national

PROBLEM: Charles Bingley was a character in what classic Jane Austen novel?

SOLUTION: charles bingley

PROBLEM: Ex-world champion boxer Alan Rudkin, who died in September 2010, fought at what weight?

SOLUTION:
alan rudkin