instruction:
Given a factoid/trivia type question, generate the topic of the question. The topic is the entity the question talks about.
question:
Which biologist was known as Darwin's Bulldog?
answer:
charles darwin


question:
Which American film actress, born in 1947, had a 14 year relationship with Clint Eastwood, starring with him in several films before splitting up in 1989?
answer:
clint eastwood


question:
Who wrote `The Day Of The Triffids`?
answer:

the day of the triffids