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

Q: 'Highway 61 Revisited' and 'Blood On The Tracks' were both albums released by which popular singer?

A: highway 61 revisited
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Q: Which legal drama starring Martin Shaw ran for six series on BBC TV from 2001?

A: martin shaw
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Q: Which American president gave the order to withdraw from the Vietnam War?

A:
vietnam war
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