instruction:
Given a factoid/trivia type question, generate the topic of the question. The topic is the entity the question talks about.
question:
The Battle of Antietam was fought during which war?
answer:
battle of antietam


question:
Which European country contains the ski resorts of Davos and Klosters?
answer:
klosters


question:
Who was Barbara Streisands first husband?
answer:

barbra streisand