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

[EX Q]: Kronos (or Cronus) was the Greek equivalent of which Roman god?
[EX A]: cronus

[EX Q]: In which city were the 1912 Olympic games held Oslo, Antwerp or Stockholm?
[EX A]: 1912 summer olympics

[EX Q]: Who wrote The Charlie Chan detective novels?
[EX A]:
charlie chan