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.

Ex Input:
Category: PARTICLE PHYSICS 
Clue: To get an element's mass number, add its protons & these

Ex Output:
neutrons


Ex Input:
Category: STUPID ANSWERS 
Clue: In the web address of the federal motor carrier safety administration, it comes just before "dot gov"

Ex Output:
dot


Ex Input:
Category: 5-LETTER WORDS 
Clue: It's the crosshatched paper used in math class

Ex Output:

graph