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: Ornette Coleman, Louis Armstrong and Charles Mingus are associated with what style of music?

SOLUTION: charles mingus

PROBLEM: In which war did the Battle of Sedan take place?

SOLUTION:
battle of sedan