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

[Q]: In which country are the Angel Falls, or Kerepakupai Ven?
[A]: angel falls

[Q]: Who plays Isobel Crawley in the UK television series 'Downton Abbey'?
[A]: downton abbey

[Q]: Who became British Prime Minister in June 1935?
[A]:
prime minister of the united kingdom