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

Example Input: In which country are the Angel Falls, or Kerepakupai Ven?
Example Output: angel falls

Example Input: Who has taken over the TV role of Doctor Who, from actor David Tennant?
Example Output: doctor who

Example Input: Queen Grimhilde, Happy and Doc are all characters in which Disney film?
Example Output:
seven dwarfs