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

[EX Q]: Charles Bingley was a character in what classic Jane Austen novel?
[EX A]: charles bingley

[EX Q]: What famous song from the film Butch Cassidy and the Sundance Kid won an Oscar for best song?
[EX A]: academy award for best original song

[EX Q]: Who starred in Alien, Ghostbusters and Avatar?
[EX A]:
avatar