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

Ex Input:
Which river begins in the Rocky Mountains in south-west Colorado, crosses New Mexico and forms the border between Mexico and the USA before reaching the Gulf of Mexico?

Ex Output:
new mexico

Ex Input:
Dreams from my father, a story of race and heritance is about which politician?

Ex Output:
dreams from my father

Ex Input:
'Maverick', 'Ice','Viper', 'Goose', 'Jester' and 'Cougar' were names used by various characters in which film?

Ex Output:
viper