instruction:
Given a factoid/trivia type question, generate the topic of the question. The topic is the entity the question talks about.
question:
Who choreographed the ballets Swan Lake and Don Quixote, among others?
answer:
don quixote


question:
Who, as the first chairman of the British Rail Board, infamously directed the huge reduction in railway lines across the UK in the 1960s?
answer:
british railways board


question:
What region did China annex?
answer:

china