Given a factoid/trivia type question, generate the topic of the question. The topic is the entity the question talks about.
--------
Question: What did Edwin Land invent because of his daughters' wish for instant and 'snappy' results?

Answer: edwin h. land


Question: Formerly known as Sky Dome, Rogers Centre is home to what American League baseball team, the only MLB team located outside the United States?

Answer: american league


Question: Who directed 'Alien 3' (1992), 'Fight Club' (1999) and 'The Social Network' (2010)?

Answer:
fight club