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 did boxer Floyd Patterson defeat to regain the Heavyweight Championship in June 1960?

SOLUTION: boxing

PROBLEM: Which jockey won the 1981 UK Grand National on Aldaniti?

SOLUTION: aldaniti

PROBLEM: What is the largest city in Canada?

SOLUTION:
canada