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

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

Output: angel falls

Input: Consider Input: On which holiday island are the peaks of 'Ruivo' and 'Arieiro', and the airport of 'Santa Cruz'?

Output: pico do arieiro

Input: Consider Input: Although not the capital, Douala is the largest city of which country?
Output: douala