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.

Category: ANATOMY 
Clue: Organ whose workings were the subject of a 1604 work by Johannes Kepler
the eye

Category: PUBLISHING 
Clue: Founded in 1856, this company introduced a numbering system for U.S. highways in 1917
rand mcnally

Category: CANDY 
Clue: Created in 1912, they were originally marketed with the slogan "For That Stormy Breath"

life savers