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

[EX 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?
[EX A]: carl xvi gustaf of sweden

[EX Q]: Who directed the film Bonnie and Clyde?
[EX A]: bonnie and clyde

[EX Q]: Who is the English voice of Ernest Penfold in the television cartoon series 'Danger Mouse'?
[EX A]:
danger mouse