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

Input: Consider Input: Who wrote the novel 'Brideshead Revisited'?

Output: brideshead revisited

Input: Consider Input: What is the only nation state of the Commonwealth of Nations on the mainland of South America?

Output: commonwealth of nations

Input: Consider Input: In Greek mythology what is the name of the youth loved and accidentally killed by Apollo, and from whose blood Apollo caused a flower to grow?
Output: apollo