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

Ex Input:
Who was British Prime Minister from 1922-23, shortly before he died?

Ex Output:
prime minister of the united kingdom


Ex Input:
Who is the current Australian prime minister ?

Ex Output:
australia


Ex Input:
In which European capital city is the Amalienborg Palace the main royal residence?

Ex Output:

amalienborg