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

Example Input: Which 1995 'Space' move starred Tom Hanks; Bill Paxton and Kevin Bacon?
Example Output: tom hanks

Example Input: Who was British Prime Minister from 1922-23, shortly before he died?
Example Output: prime minister of the united kingdom

Example Input: in 2009 campaigners in Barcelona heightened demands to clean up what famous avenue?
Example Output:
barcelona