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

[EX Q]: The towns od Grimsby and Cleethorpes are in which English county?
[EX A]: grimsby

[EX Q]: The Neil Simon plays The Prisoner of Second Avenue and Brighton Beach Memoirs are set in which city?
[EX A]: brighton beach memoirs

[EX Q]: The first world's fair in the United States since World War II, what city hosted the 1962 World's Fair, known as Century 21 Exposition?
[EX A]:
century 21 exposition