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: Lexus is the luxury vehicle division of what car maker?

Answer: lexus


Question: Who is the most famous cartoon creation of Chester Gould?

Answer: chester gould


Question: How are the lovers Vrechen and Sali described in the title of a 1906 opera by Delius?

Answer:
frederick delius