Question: The mint julep is a mixed alcoholic drink, or cocktail, consisting primarily of Bourbon whiskey, a whiskey of which nationality, a barrel-aged distilled spirit made primarily from corn?
Sentence (from "Bourbon whiskey"): As of 2014, the distillers' wholesale market revenue for bourbon sold within the U.S. is about $2.7 billion, and bourbon makes up about two-thirds of the $1.6 billion of U.S. exports of distilled spirits.
Relevant evidence: No