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

Q: Princess Estelle, Duchess of Ostergotland, granddaughter to King Carl XVI Gustaf, became 2nd in line to what nation's throne when born in 2012?

A: carl xvi gustaf of sweden
****
Q: I which European city will you find 'Dam Square'?

A: dam square
****
Q: Which P.G. Wodehouse character has a butler 'Sebastian Beach' and a gardener 'Angus McAllister'?

A:
the custody of the pumpkin
****