TASK DEFINITION: Given a factoid/trivia type question, generate the topic of the question. The topic is the entity the question talks about.
PROBLEM: Name Shakespeare play Ariel, Miranda and Prospero appear?

SOLUTION: ariel

PROBLEM: What style of facial hair was famously worn by American Civil War general Ambrose Burnside?

SOLUTION: ambrose burnside

PROBLEM: Who was the Vice President of former US President Bill Clinton?

SOLUTION:
bill clinton