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:
From which musical did the song 'Chim Chim Cheree' come?
answer:
chim chim cher-ee


question:
Who was assassinated on the Ides of March?
answer:

assassination of julius caesar