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

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

In which city will the 2014 Tour de France begin?
2014 tour de france

Which group had a number one hit in 1977 with Chanson D'amour?

chanson d'amour