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 the first Apollo mission to leave Earth orbit and orbit the moon, in 1968?

SOLUTION: apollo

PROBLEM: In 2011, Christian Bale won a Best Supporting Actor Oscar for his role as an assistant to his half-brother in which boxing related film?

SOLUTION: christian bale

PROBLEM: The American television series 'Angel' was a spin-off of which other hugely popular show?

SOLUTION:
angel