TASK DEFINITION: Given a factoid/trivia type question, generate the topic of the question. The topic is the entity the question talks about.
PROBLEM: In which city will the 2014 Tour de France begin?

SOLUTION: 2014 tour de france

PROBLEM: Which former Blue Peter presenter died in April 2004, aged 41?

SOLUTION: blue peter

PROBLEM: In which film does Dustin Hoffman play Michael Dorsey and Dorothy Michaels?

SOLUTION:
dustin hoffman