instruction:
Given a factoid/trivia type question, generate the topic of the question. The topic is the entity the question talks about.
question:
Brasilia is the capital but which city in Brazil has the largest population?
answer:
brazil

question:
Which Frenchman composed Clair de lune, the famous third movement of Suite bergamasque?
answer:
suite bergamasque

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