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 book was written by Alexandre Dumas about Edmond Dantes' imprisonment in the Chateau d'If?

SOLUTION: alexandre dumas

PROBLEM: Chris Martin is the lead vocalist and rhythm guitarist with which group?

SOLUTION: chris martin

PROBLEM: In 1948 which South African became the first person from outside the UK to hold the post of Chancellor of Cambridge University, a post he held until his death in 1950?

SOLUTION:
university of cambridge