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: CORPORATE AMERICA 
Clue: Every year, this company delivers more than a billion packages, more than the Post Office
[EX A]: ups

[EX Q]: Category: JAZZ 
Clue: Louis Armstrong's mentor, this jazz "King" was ruined by dental trouble & died while working as a poolroom marker
[EX A]: "king" oliver

[EX Q]: Category: GEOGRAPHY 
Clue: 2 of 4 countries bordering Greece
[EX A]:
yugoslavia, turkey, bulgaria, albania