Given a factoid/trivia type question, generate the topic of the question. The topic is the entity the question talks about.

Ex Input:
Which biologist was known as Darwin's Bulldog?

Ex Output:
charles darwin

Ex Input:
What is the French name for the English Channel?

Ex Output:
channel

Ex Input:
According to the Bible, who was told by God to build an ark to escape the Great Flood?

Ex Output:
noah's ark