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

Q: Charon is a moon which orbits which body?

A: charon
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Q: The site of the 1461 Battle of Mortimer's Cross lies in which English county?

A: battle of mortimer's cross
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Q: The Biebrza and the Warta are rivers in which European country?

A:
biebrza
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