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

Which race run at Chantilly in June is often referred to as the French Derby?
chantilly racecourse

Seymour is the family name of which English duke?
duke

In which country was there a civil war between 1861 and 1865, which was lost by the Confederate forces?

american civil war