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.

[EX Q]: Category: BORDERS 
Clue: Argentina's border with this country is 3,200 miles long, about the same as its coastline
[EX A]: chile

[EX Q]: Category: AMERICAN HISTORY 
Clue: On June 21, 1982 he was found not guilty by reason of insanity in the shooting of President Reagan
[EX A]: john hinckley

[EX Q]: Category: NEWTONIAN PHYSICS 
Clue: Newton believed light was made of particles called these, like red & white blood cells
[EX A]:
corpuscles