TASK DEFINITION: Given a factoid/trivia type question, generate the topic of the question. The topic is the entity the question talks about.
PROBLEM: Which popular Doctor Who villains, it was revealed in 2011, are to be given 'a rest' by scriptwriters?

SOLUTION: doctor who

PROBLEM: Which SF author wrote The Day it Rained Forever?

SOLUTION: the day it rained forever

PROBLEM: What was the primary language of the Byzantine Empire?

SOLUTION:
byzantine empire