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: Which legal drama starring Martin Shaw ran for six series on BBC TV from 2001?

SOLUTION: martin shaw

PROBLEM: Who wrote the children's classic 'Charlotte's Web'?

SOLUTION:
charlotte's web