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.

[Q]: Category: CONTEMPORARY AMERICANS 
Clue: In December 1996 his reference to "Irrational Exuberance" sent stock prices plunging around the world
[A]: alan greenspan


[Q]: Category: NATURE 
Clue: The propagation of oak trees depends on the lousy memories of these animals
[A]: squirrels


[Q]: Category: 17th CENTURY PERSONALITIES 
Clue: Despite being the personal physician of 2 British kings, he was derogatorily known as "The Circulator"
[A]:
harvey