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

Q: Which European country contains the ski resorts of Davos and Klosters?

A: klosters
****
Q: What name is given to the Fourth (4th) movement in Beethoven's / Ninth (9th) Symphony?

A: ludwig van beethoven
****
Q: Xerxes led the Persian forces at the Battle of Thermopylae in 480 BC. His enemy was an alliance of the Greek city-states led by Leonidas. Of which city-state was he king?

A:
battle of thermopylae
****