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

Ex Input:
In May 1940, who became British Prime Minister after the resignation of Neville Chamberlain?

Ex Output:
prime minister of the united kingdom


Ex Input:
What is the smallest country in Central America Costa Rica, Venezuela or El Salvador?

Ex Output:
central america


Ex Input:
Which singer who sang '24 Hours From Tulsa' died April 2006 at the age of 65?

Ex Output:

twenty four hours from tulsa