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 20th century British prime minister had the longest surname ?

SOLUTION: prime minister of the united kingdom

PROBLEM: Which BBC current affairs programme, the longest-running in the world, is 60 years old this year ?

SOLUTION: bbc

PROBLEM: Abkhazia, recognised as independent by Russia, is a breakaway region from which former Soviet republic?

SOLUTION:
abkhazia