TASK DEFINITION: Given a factoid/trivia type question, generate the topic of the question. The topic is the entity the question talks about.
PROBLEM: Grace Anna Goodhue was the wife of which US President?

SOLUTION: grace coolidge

PROBLEM: What is the country of origin of the cheese called caerphilly?

SOLUTION: caerphilly cheese

PROBLEM: David Stern was the commissioner of what organization?

SOLUTION:
david stern