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: IRISH EYES 
Clue: Hey, 20 bucks says that you know this president's father was from County Antrim & his mother was Irish, too
andrew jackson

Category: A LITTLE OF THE BUBBLY 
Clue: Roy Allen opened root beer stands in 1922 & introduced this brand name for his product
a&w

Category: AS "U" LIKE IT 
Clue: AKA Northern Ireland

ulster