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]: Which novel by A J Cronin is credited with laying down the foundation in Great Britain for the introduction of the National Health Service?
[EX A]: a. j. cronin

[EX Q]: What breed of dog was Lassie?
[EX A]:
dog