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: Formerly known as Sky Dome, Rogers Centre is home to what American League baseball team, the only MLB team located outside the United States?

Answer: american league


Question: Which country had a parliament called the Duma?

Answer: state duma


Question: Who, in Greek myth, was the daughter of Agamemnon and Clytemnestra, sacrificed at Aulis by her father to ensure a safe passage to Troy?

Answer:
agamemnon