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

[Q]: Which chemical element is named after the Latin for Copenhagen where it was discovered?
[A]: copenhagen


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


[Q]: 'The Arnolfini Marriage' is a famous 1434 painting by whom?
[A]:
arnolfini portrait