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

Ex Input:
What breed of dog is Marmaduke in the newspaper cartoon strip of that name?

Ex Output:
dog


Ex Input:
Everything Changes, Beautiful World and Circus are all albums released by which British band?

Ex Output:
beautiful world


Ex Input:
Which is the main port on the River Amazon estuary?

Ex Output:

amazon