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 horse won the 2009 Grand National?

SOLUTION: 2009 grand national

PROBLEM: Joseph Addison and Richard Steele founded (in 1711), and Boris Johnson edited, which British magazine?

SOLUTION: boris johnson

PROBLEM: Who won the Booker Prize in 1990 with the novel 'Possession'?

SOLUTION:
man booker prize