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

In which range of mountains are the two highest peaks Aconcagua and Ojos Del Salado?
aconcagua

Who choreographed the ballets Swan Lake and Don Quixote, among others?
don quixote

Which European city is served by Domodedovo Airport?

domodedovo international airport