TASK DEFINITION: Given a factoid/trivia type question, generate the topic of the question. The topic is the entity the question talks about.
PROBLEM: Carpo and Elara are moons of which planet?

SOLUTION: elara

PROBLEM: To which country do the Chatham Islands belong?

SOLUTION: chatham islands

PROBLEM: Who plays the role of Lieutenant Aldo Raine in the 2009 film 'Inglorious Basterds'?

SOLUTION:
inglourious basterds