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

Ex Input:
Who is the only British Prime Minister to serve under 3 monarchs?

Ex Output:
prime minister of the united kingdom

Ex Input:
What canal opened in Egypt?

Ex Output:
egypt

Ex Input:
Which notable leader won the 2009 Nobel Peace Prize?

Ex Output:
2009 nobel peace prize