TASK DEFINITION: Given a factoid/trivia type question, generate the topic of the question. The topic is the entity the question talks about.
PROBLEM: Which singer provides the voice for Chef in South Park?

SOLUTION: chef

PROBLEM: Where on Prince Edward Island, Canada, is Anne of Green Gables located?

SOLUTION: canada

PROBLEM: Which Charles Dickens novel, his last completed work, features' John Harmon' and the title character 'John Rokesmith'?

SOLUTION:
charles dickens