TASK DEFINITION: Given a factoid/trivia type question, generate the topic of the question. The topic is the entity the question talks about.
PROBLEM: Ashgabat is the capital of which country, a former Soviet republic in Asia?

SOLUTION: ashgabat

PROBLEM: Who hosted Call My Bluff?

SOLUTION: call my bluff

PROBLEM: Who was the first person to sign the American Declaration of Independence?

SOLUTION:
united states declaration of independence