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 biologist was known as Darwin's Bulldog?

SOLUTION: charles darwin

PROBLEM: Which Frenchman composed Clair de lune, the famous third movement of Suite bergamasque?

SOLUTION: suite bergamasque

PROBLEM: The group Smile, formed in 1968 by Roger Taylor, Tim Staffel and Brian May, changed their name to what after Tim Staffel was replaced as vocalist?

SOLUTION:
brian may