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

What is the capital of the American state of Delaware Boise, Dover or Jefferson City?
delaware

What sport is featured in the musical The Beautiful Game by Andrew Lloyd Webber and Ben Elton?
the beautiful game

The painting that has the words ceci n'est pas une pipe written on it, is by which artist?

the treachery of images