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

[EX Q]: After Harold McMillan who was Britain's next Prime Minister?
[EX A]: britain

[EX Q]: In which country did the dance The Czardas originate?
[EX A]: csardas

[EX Q]: Released in March 2008, the film 'Horton Hears A Who !',starring Jim Carrey, was based on a book of the same name by which author?
[EX A]:
horton