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

Q: In which constellation is the star Deneb?

A: deneb
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Q: What is the largest city in Bavaria?

A: bavaria
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Q: Who played Butch Cassidy in the 1969 film `Butch Cassidy and the Sundance Kid`?

A:
butch cassidy
****