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

The headquarters building of which government agency is known as 'The Doughnut' due to its shape?
the doughnut

Which Nation does Aston Villa Goalkeeper Brad Guzan represent?
brad guzan

What is the translation of the work Le Sacre du Printemps (in ballet)?

le sacre du printemps