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

Q: What was the name of Chuck Berry's 1972 hit which gave him his first number one?

A: chuck berry
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Q: Which BBC current affairs programme, the longest-running in the world, is 60 years old this year ?

A: bbc
****
Q: What is the name of the Amtrak train that runs from Seattle's King Street Station to Union Station in Los Angeles?

A:
amtrak
****