TASK DEFINITION: Given a factoid/trivia type question, generate the topic of the question. The topic is the entity the question talks about.
PROBLEM: In which famous film did Michael Caine play a character named Charlie Croker?

SOLUTION: charlie croker

PROBLEM: What is the main river of Brazil?

SOLUTION: brazil

PROBLEM: Which actress played Bathsheba Everdene in the 1967 film 'Far From the Madding Crowd'?

SOLUTION:
far from the madding crowd