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

Ex Input:
Which jockey rode Red Alligator to victory in the 1968 Grand National?

Ex Output:
red alligator


Ex Input:
Which of North America's Great Lakes has the same name as a province of Canada?

Ex Output:
canada


Ex Input:
Starship Troopers, Stranger in a Strange Land, The Moon is a Harsh Mistress, The Cat Who Walks Through Walls?

Ex Output:

stranger in a strange land