TASK DEFINITION: Given a factoid/trivia type question, generate the topic of the question. The topic is the entity the question talks about.
PROBLEM: What style of facial hair was famously worn by American Civil War general Ambrose Burnside?

SOLUTION: ambrose burnside

PROBLEM: In which US state are the Catskill Mountains?

SOLUTION: catskill mountains

PROBLEM: Who, in 1632, painted 'The Anatomy Lesson of Dr. Tulp'?

SOLUTION:
the anatomy lesson of dr. nicolaes tulp