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 pop group consisted of Huw Bunford, Clan Caren, Dafydd Leuan, Guto Price and Gryff Rhuys?

SOLUTION: huw bunford

PROBLEM: Ride of the Valkyries is the official quick march of which branch of the British Army?

SOLUTION: british army

PROBLEM: In which city does the Blue Nile meet the White Nile?

SOLUTION:
white nile