Given a factoid/trivia type question, generate the topic of the question. The topic is the entity the question talks about.
--------
Question: 'Edward Lewis' and 'Vivian Ward' were the principal characters in which popular 1990 film?

Answer: edward lewis


Question: What did Edwin Land invent because of his daughters' wish for instant and 'snappy' results?

Answer: edwin h. land


Question: Which US pop artist created 100 Campbells Soup Cans?

Answer:
campbell's soup cans