TASK DEFINITION: Given a factoid/trivia type question, generate the topic of the question. The topic is the entity the question talks about.
PROBLEM: Who directed the 1988 film 'Beetle Juice'?

SOLUTION: beetlejuice

PROBLEM: Chris Martin is the lead singer with which band who had several hits in the 2000s?

SOLUTION: chris martin

PROBLEM: In what 1949 classic English comedy from Ealing Studios does Alec Guinness play 8 roles?

SOLUTION:
alec guinness