Given a factoid/trivia type question, generate the topic of the question. The topic is the entity the question talks about.
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Question: Which Beatles song was also recorded by Peter Sellers?

Answer: the beatles


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

Answer: toronto blue jays


Question: In Star Wars what alien species is Chewbacca?

Answer:
chewbacca