instruction:
Given a factoid/trivia type question, generate the topic of the question. The topic is the entity the question talks about.
question:
In which city were the 2002 Winter Olympic Games held?
answer:
2002 winter olympics

question:
Which pop group consisted of Huw Bunford, Clan Caren, Dafydd Leuan, Guto Price and Gryff Rhuys?
answer:
huw bunford

question:
Because of his advocation for the use of direct current (DC) for electric power distribution, Thomas Edison developed a bitter rivalry with which other genius who advocated alternating current (AC)?
answer:
alternating current