instruction:
Given a factoid/trivia type question, generate the topic of the question. The topic is the entity the question talks about.
question:
I which European city will you find 'Dam Square'?
answer:
dam square


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


question:
In astrology which heavenly body rules the sign of Cancer?
answer:

cancer