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

Ex Input:
The Bryce Canyon and Zion National Parks are in which US state?

Ex Output:
bryce canyon national park

Ex Input:
Which play and film was adapted from a story by Christopher Isherwood and later adapted as the musical and film Cabaret?

Ex Output:
cabaret

Ex Input:
In which European city is Charles university?

Ex Output:
charles university in prague