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: The wine-producing region of Hunter Valley is in which Australian state?

Answer: australia


Question: Mr Barkis, Edward Murdstone and Tommy Traddles are all characters in which Charles Dickens novel?

Answer: charles dickens


Question: Published in 1826 whose song, a rendition of 'Ave Maria', is classified as Opus 52 no 6?

Answer:
ave maria