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

Ex Input:
Who composed the opera 'Albert Herring' in 1947?

Ex Output:
albert herring


Ex Input:
Bob Clampett created which character in 1938?

Ex Output:
bob clampett


Ex Input:
In which country is the Bolivar the main unit of currency?

Ex Output:

venezuelan bolivar