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

Ex Input:
Which cyclist won the first medal for Team GB at the 2012 Olympic Games?

Ex Output:
gb

Ex Input:
Which 1970s musical film starred Angela Lansbury as a trainee witch?

Ex Output:
angela lansbury

Ex Input:
Who became British Prime Minister in October 1922?

Ex Output:
prime minister of the united kingdom