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

Q: Which British singer released a 1972 album entitled 'Blondes Have More Fun'?

A: blondes have more fun
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Q: What style of facial hair was famously worn by American Civil War general Ambrose Burnside?

A: ambrose burnside
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Q: Who was the hero of several Sir Arthur Canon Doyle stories, first introduced in The Lost World?

A:

Show your work and conclude with the exact phrasing "Therefore, the final answer is [answer]." where [answer] is just the final number or expression that solves the problem.
user
the lost world
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