Given a factoid/trivia type question, generate the topic of the question. The topic is the entity the question talks about.

[Q]: Who played 'Emma Peel' in the 1998 film 'The Avengers'?
[A]: the avengers


[Q]: The Byzantine Empire is the term used since the 19th century to describe the Roman Empire of the Middle Ages, centred on its capital, where?
[A]: byzantine empire


[Q]: Which country does pop act Avicii come from?
[A]:
avicii