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

Q: Which river begins in the Rocky Mountains in south-west Colorado, crosses New Mexico and forms the border between Mexico and the USA before reaching the Gulf of Mexico?

A: new mexico
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Q: Who was the only child vampire in Anne Rice`s novels?

A: anne rice
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Q: In Greek mythology Deianeira was the wife of who?

A:
deianira
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