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: U.S. PRESIDENTS 
Clue: The last names of 8 different presidents end with this 3-letter combination
answer:
son


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


question:
Category: DATES IN AMERICAN HISTORY 
Clue: On this date Philadelphia partied with fireworks & music from a Hessian band captured 6 months earlier
answer:

july 4, 1777