instruction:
Given a factoid/trivia type question, generate the topic of the question. The topic is the entity the question talks about.
question:
The headquarters building of which government agency is known as 'The Doughnut' due to its shape?
answer:
the doughnut


question:
What country has an official residence called Blair House, kept for guests of the leader of the country?
answer:
blair


question:
Kurt Waldheim, U Thant, Trygvie Lie and Boutros Boutros Ghali have all held which post?
answer:

kurt waldheim