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: OPTICS 
Clue: On New Year's or any other day, it's the fineness of detail that can be distinguished in a photographic image
answer:
resolution


question:
Category: THE ELEMENTS 
Clue: Most fluorescent lights are filled with a combination of argon & this element, Kr
answer:
krypton


question:
Category: NOM DE PLUME 
Clue: Mystery writer Nicholas Blake, in reality a "My Left Foot" star's father
answer:

cecil day-lewis