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 consistency, answers should be in all lower cased letters.

Category: ART & ARTISTS 
Clue: This "Joy of Life" Fauvist studied law, but turned to painting when recuperating from an operation (Good choice!)
henri matisse

Category: RED ROVER, RED ROVER 
Clue: This NASA "Lab" based in Pasadena designed the rovers used on Mars
jpl

Category: 5-SYLLABLE WORDS 
Clue: From the Greek for "thief", it's someone who suffers from an irresistible impulse to steal

a kleptomaniac