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: In which country are the Angel Falls, or Kerepakupai Ven?

Answer: angel falls

Question: July 1938 saw the first ascent of the North Face of which Alpine mountain?

Answer: alps

Question: Which detective is the protagonist of the novels Dead Man's Folly, Cards on the Table and Mrs McGinty's Dead?

Answer:
dead man's folly