instruction:
Given a factoid/trivia type question, generate the topic of the question. The topic is the entity the question talks about.
question:
Princess Estelle, Duchess of Ostergotland, granddaughter to King Carl XVI Gustaf, became 2nd in line to what nation's throne when born in 2012?
answer:
carl xvi gustaf of sweden


question:
Which British singer released a 1972 album entitled 'Blondes Have More Fun'?
answer:
blondes have more fun


question:
Which city is the administrative centre of the French region of Alsace?
answer:

alsace