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: Who played the title role in the 1955 film 'Davy Crockett, King Of The Wild Frontier'?

Answer: davy crockett


Question: Which current Broadway musical has a Japanese therapist character called Christmas Eve?

Answer: christmas eve


Question: Who wrote the opera Der Rosenkavalier?

Answer:
der rosenkavalier