Given an trivia question precisely answer the question with a word/phrase/name. External resources such as Wikipedia could be used to obtain the facts.
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Question: Which of Jupiter's Moons is largest?

Answer: ganymede

Question: What pop singer was born in Lucknow India?

Answer: cliff richard

Question: Sergio Leone, Otto Preminger, Fritz Lang and Fred Zinnemann are famous 20thC?

Answer:
film director