instruction:
Given a factoid/trivia type question, generate the topic of the question. The topic is the entity the question talks about.
question:
What country has an official residence called Blair House, kept for guests of the leader of the country?
answer:
blair

question:
In which city will the 2014 Tour de France begin?
answer:
2014 tour de france

question:
Bessie Wallis Warfield became better known as whom?
answer:
bessie wallis warfield