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: In which bay is Alcatraz?

Answer: alcatraz island


Question: Which instrument was Benny Goodman famous for playing?

Answer: benny goodman


Question: Who wrote the series of novels featuring the adventurer 'Dirk Pitt'?

Answer:
dirk pitt