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

In which opera does a hunchback jester help his master, the Duke of Mantua, to seduce the daughter of a courtier?
duke of mantua

In 1951, which European country saw the abdication of King Leopold lll in favour of his son Baudouin?
baudouin of belgium

Paul Young and Susan Boyle have covered Don't Dream It's Over, which was written for (and was a US hit record for) which band?

don't dream it's over