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

[EX Q]: In which Shakespeare play do the characters Ajax, Achilles and Ulysses appear?
[EX A]: achilles

[EX 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?
[EX A]: american league

[EX Q]: In which country is the confluence of the White Nile and the Blue Nile?
[EX A]:
white nile