Given a factoid/trivia type question, generate the topic of the question. The topic is the entity the question talks about.
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Question: Chep Lap Kok airport is located where?

Answer: hong kong international airport


Question: Kronos (or Cronus) was the Greek equivalent of which Roman god?

Answer: cronus


Question: What was the title of the first ever 'Carry On' film?

Answer:
carry on