Which of the following spirits is primarily derived from grain fermentation?

Gin is primarily derived from grain fermentation. The production process involves fermenting grains such as barley, corn, rye, or wheat to create a base spirit. After fermentation, this spirit undergoes distillation. The defining characteristic of gin is the addition of botanicals, particularly juniper berries, which give gin its distinct flavor profile.

In contrast, rum is made from sugarcane products, such as molasses or sugarcane juice, which are fermented separately. Tequila is derived from the blue agave plant, involving a different source material altogether, making it distinct from grain-based spirits. Absinthe, while it can include grain in its production, is primarily characterized by the infusion of various herbs and botanicals, similar to gin, but does not primarily derive its base from grain fermentation. This differentiates gin as the correct choice among the options provided.