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

Example Input: What is the name of the main thoroughfare in Barcelona, which runs from the Placa de Catalunya to the sea?
Example Output: barcelona

Example Input: In which shipping forecast area are the Channel Islands?
Example Output: channel islands

Example Input: In which country is the city and naval base of Cadiz?
Example Output:
cadiz