instruction:
You will be given a trivia clue, and the category it belongs to. You should answer with the best answer that belongs in the category and is described by the clue. For simplicity, answers should be in all lower cased letters.
question:
Category: CONTEMPORARY AMERICANS 
Clue: In December 1996 his reference to "Irrational Exuberance" sent stock prices plunging around the world
answer:
alan greenspan


question:
Category: POLITICAL PHILOSOPHY 
Clue: The subtitle of this influential 1762 treatise is "Principes du droit politique" ("Principles of Political Right")
answer:
the social contract


question:
Category: FUN WITH NUMBERS 
Clue: It's the only whole number that when spelled out has all its letters in reverse alphabetical order
answer:

one