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

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

[Q]: Which 20th century British prime minister had the longest surname ?
[A]: prime minister of the united kingdom

[Q]: Who wrote the plays 'The Cocktail Party' and 'The Family Reunion'?
[A]:
the family reunion