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

[EX Q]: Category: THE LAST CATEGORY 
Clue: This "Home Run King" played in his 3,298th & last game for the Milwaukee Brewers in 1976
[EX A]: hank aaron

[EX Q]: Category: COUNTRY OF ORIGIN 
Clue: Birkenstock, as in shoes
[EX A]:
germany