TASK DEFINITION: Given a factoid/trivia type question, generate the topic of the question. The topic is the entity the question talks about.
PROBLEM: Who played the character Gene Hunt in the UK TV series 'Life on Mars' and 'Ashes to Ashes'?

SOLUTION: life on mars

PROBLEM: In the British Army, what rank falls between Major General and Colonel?

SOLUTION: british army

PROBLEM: Which jockey won the 2010 Aintree Grand National on 'Don't Push It', at his fifteenth attempt?

SOLUTION:
don't push it