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 currency of Austria before the Euro?

Answer: austria


Question: What was Paul McCartney's first solo album called?

Answer: album


Question: Boney M's UK chart topping hit of 1978 was a double A-side, Rivers of Babylon was on one side, which song was on the other?

Answer:
boney m.