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

In which town in California is Disneyland?
disneyland

The Battle of Antietam was fought during which war?
battle of antietam

Which late 17th and early 18th century British architect designed Brighton Pavilion, Marble Arch, and the plan for London's Regents Park?

royal pavilion