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

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

A: bbc
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Q: Which city has sports teams known as the 'Maple Leafs' and the 'Blue Jays'?

A: toronto blue jays
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Q: Which planet in our solar system is known as 'The Blue Planet'?

A:
solar system
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