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: PARTICLE PHYSICS 
Clue: To get an element's mass number, add its protons & these
answer:
neutrons


question:
Category: 5-LETTER WORDS 
Clue: It's the crosshatched paper used in math class
answer:
graph


question:
Category: TV SHOWS BY GROUPS 
Clue: From 1955, the International Order of Friendly Sons of the Raccoons
answer:

the honeymooners