TASK DEFINITION: Given a factoid/trivia type question, generate the topic of the question. The topic is the entity the question talks about.
PROBLEM: What is the only nation state of the Commonwealth of Nations on the mainland of South America?

SOLUTION: commonwealth of nations

PROBLEM: Which football team play home games at Bloomfield Road?

SOLUTION: bloomfield road

PROBLEM: Who wrote the novel The Cider House Rules?

SOLUTION:
the cider house rules