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: The towns od Grimsby and Cleethorpes are in which English county?

SOLUTION: grimsby

PROBLEM: In June 1938, Action Comics #1 was published, featuring which comic book hero for the first time?

SOLUTION:
action comics