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 was British Prime Minister from 1922-23, shortly before he died?

SOLUTION: prime minister of the united kingdom

PROBLEM: The Bryce Canyon and Zion National Parks are in which US state?

SOLUTION: bryce canyon national park

PROBLEM: Which 1970s musical film starred Angela Lansbury as a trainee witch?

SOLUTION:
angela lansbury