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

Princess Estelle, Duchess of Ostergotland, granddaughter to King Carl XVI Gustaf, became 2nd in line to what nation's throne when born in 2012?
carl xvi gustaf of sweden

Cinder Cone, composite, and shield are all types of what?
cinder cone

Who wrote the song Easter Parade?

easter parade