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 consistency, answers should be in all lower cased letters.

Category: HEIR CONDITIONING 
Clue: 37-year-old Reza Pahlevi is the exiled heir to this country's "Peacock Throne"
iran

Category: THEY'RE BA-A-CK! 
Clue: Colorful term for foods like beef & lamb, making a comeback due to the low-carb craze
red meats

Category: COMPUTER ABBREV. 
Clue: Useful for connecting devices, USB is short for Universal Serial this

bus