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: What was the computer's name in 2001: A Space Odyssey?

SOLUTION: 2001: a space odyssey

PROBLEM: What river runs through Phoenix, Arizona, USA?

SOLUTION:
arizona