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 Q]: Category: MILITARY TRAINING BASES 
Clue: Service branch with a San Diego recruit depot & a Yuma air station
[EX A]: marines

[EX Q]: Category: PARTICLE PHYSICS 
Clue: To get an element's mass number, add its protons & these
[EX A]: neutrons

[EX Q]: Category: BEFORE & AFTER 
Clue: "Hybrid Theory" & "Meteora" are albums by this alt-metal band that's the second-priciest Monopoly property
[EX A]:
linkin park place