instruction:
Given a factoid/trivia type question, generate the topic of the question. The topic is the entity the question talks about.
question:
Eden Park staged some of the 2011 Rugby World Cup matches, in which city can it be found?
answer:
eden park


question:
Who composed 'Eine Kleine Nachtmusik' in the 18th Century?
answer:
eine kleine nachtmusik


question:
Who played Captain Jack Sparrow in the 'Pirates of the Caribbean' series of films?
answer:

jack sparrow