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 was the last silent film in which Chaplin's little tramp appeared?

SOLUTION: chaplin

PROBLEM: Pirate Edward Teach was better known by what nickname?

SOLUTION: edward teach

PROBLEM: May 25, 1803 saw the birth, in Boston, MA, of what lecturer, essayist, and poet, who, along with Henry David Thoreau, was a founding force behind Transcendentalism?

SOLUTION:
boston