TASK DEFINITION: Given a factoid/trivia type question, generate the topic of the question. The topic is the entity the question talks about.
PROBLEM: Which boxer won a 1.8m claim against promotor Frank Warren in March 2009?

SOLUTION: boxing

PROBLEM: Carpo and Elara are moons of which planet?

SOLUTION: elara

PROBLEM: Which SAS soldier wrote the book 'Bravo Two Zero', an account of a failed mission during the (1st) Gulf War?

SOLUTION:
bravo two zero