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, as the first chairman of the British Rail Board, infamously directed the huge reduction in railway lines across the UK in the 1960s?

A: british railways board
****
Q: Who married Welsh actress Catherine Zeta Jones in 2000?

A:
catherine zeta-jones
****