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

Ex Input:
What was the first British credit card?

Ex Output:
credit card


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

Ex Output:
charles darwin


Ex Input:
Which singer married model Christie Brinkley in 1985?

Ex Output:

christie brinkley