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

[Q]: Which Nation does Aston Villa Goalkeeper Brad Guzan represent?
[A]: brad guzan

[Q]: Formerly known as Sky Dome, Rogers Centre is home to what American League baseball team, the only MLB team located outside the United States?
[A]: american league

[Q]: Which rapper is the husband of R and B superstar singer, Beyonce?
[A]:
beyonce