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 Paul McCartney's first solo album called?

SOLUTION: album

PROBLEM: What is the alcoholic ingredient of a Screwdriver cocktail?

SOLUTION: screwdriver

PROBLEM: Who was the wing commander who led the 'Dambusters' bomber raids in 1943?

SOLUTION:
operation chastise