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

[EX Q]: Besides the Caucasus, what mountain range forms the border of Europe and Asia?
[EX A]: asia

[EX Q]: The Ivy League University 'Dartmouth College' is in which US state?
[EX A]: dartmouth college

[EX Q]: Which Hungarian composer lived from 1881-1945 - his only opera was 'Duke Bluebeard's Castle'?
[EX A]:
bluebeard's castle