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

[Q]: The headquarters building of which government agency is known as 'The Doughnut' due to its shape?
[A]: the doughnut


[Q]: Feb 15, 1564 saw the birth of what famed Italian physicist, mathematician, astronomer, and philosopher, who discovered the first 4 moons of Jupiter?
[A]: astronomer


[Q]: What breed of dog was a favored imperial pet in ancient China?
[A]:
dog