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 singer played Billie Holiday in the 1972 film 'Lady Sings The Blues'?

Answer: lady sings the blues

Question: What currency is used on Christmas Island?

Answer: christmas island

Question: Who organised an Arab revolt against the Turks and wrote The Seven Pillars Of Wisdom about his experiences?

Answer:
arab revolt