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

[EX Q]: Where is David Cameron's Oxfordshire constituency?
[EX A]: david cameron

[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 famous singer was a member of 'Bluesology' in the early 1960s, leaving in 1967 and changing his name to one that was a combination of the names of two members of the group?
[EX A]:
bluesology