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

Ex Input:
Who composed 'Eine Kleine Nachtmusik' in the 18th Century?

Ex Output:
eine kleine nachtmusik


Ex Input:
Who choreographed the ballets Swan Lake and Don Quixote, among others?

Ex Output:
don quixote


Ex Input:
What wonder drug was discovered by Alexander Fleming?

Ex Output:

alexander fleming