TASK DEFINITION: Given a factoid/trivia type question, generate the topic of the question. The topic is the entity the question talks about.
PROBLEM: The Bryce Canyon and Zion National Parks are in which US state?

SOLUTION: bryce canyon national park

PROBLEM: In which city was Christopher Columbus born?

SOLUTION: columbus

PROBLEM: What is the title of a detective crime novel by Robert B. Parker, written as an authorised sequel to The Big Sleep by Raymond Chandler?

SOLUTION:
the big sleep