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

Q: What was the first Apollo mission to leave Earth orbit and orbit the moon, in 1968?

A: apollo
****
Q: Which British Prime Minister delivered the 'Winds of Change' speech in 1960?

A: wind of change
****
Q: What is the capital city of Croatia?

A:
croatia
****