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

[EX Q]: The plays 'The Barber of Seville' and 'Marriage of Figaro' were written by whom?
[EX A]: the marriage of figaro

[EX Q]: In which English city was Damien Hirst born?
[EX A]: damien hirst

[EX Q]: What is the capital city of China?
[EX A]:
china