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

[Q]: What is the only nation state of the Commonwealth of Nations on the mainland of South America?
[A]: commonwealth of nations

[Q]: Which musical has the songs 'Another Suitcase In Another Hall' and 'Oh What A Circus'?
[A]: another suitcase in another hall

[Q]: The Rhodope Mountains lie mostly in which East European country?
[A]:
rhodope mountains