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]: Name the town in California where Clint Eastwood was elected mayor in 1986.?
[EX A]: clint eastwood

[EX Q]: Whose first number album in the UK was Dead Ringer' in 1981?
[EX A]:
dead ringer