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 directed the film Black Swan (in ballet)?

SOLUTION: black swan

PROBLEM: What is the main river of Brazil?

SOLUTION: brazil

PROBLEM: Kenneth Moore portrayed which famous 2nd World War fighter pilot in the 1956 film Reach for the Sky?

SOLUTION:
reach for the sky