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: What was the computer's name in 2001: A Space Odyssey?

Answer: 2001: a space odyssey


Question: The headquarters building of which government agency is known as 'The Doughnut' due to its shape?

Answer: the doughnut


Question: An official Disney Princess, what is the name of the princess of Agrabah, heroine of the film Aladdin?

Answer:
aladdin