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

Ex Input:
I which European city will you find 'Dam Square'?

Ex Output:
dam square


Ex Input:
Of which Canadian Province is Labrador a part?

Ex Output:
canada


Ex Input:
In which state of the USA is the Badlands National Park?

Ex Output:

badlands national park