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

Which Beatle played Youngman Grand in The Magic Christian 1969, with Peter Sellers?
the beatles

What horse won the 2009 Grand National?
2009 grand national

What was the name of the character played by Christopher Lloyd in the Back to The Future series of films?

back to the future