Which classic cocktail uses gin as its primary spirit?

The classic cocktail that uses gin as its primary spirit is the Martini. The Martini is traditionally made with gin and dry vermouth, and it is known for its crisp and refreshing flavor. The combination of gin, which is a spirit that has a strong botanical flavor profile largely derived from juniper berries, with the herbal notes of vermouth creates a balanced drink that is both aromatic and sophisticated.

Martinis can be served straight up, meaning chilled and without ice, or on the rocks, which includes ice. This cocktail has a long-standing reputation as a staple in cocktail culture and is often associated with elegance and class. Its history dates back to the late 19th century, and it has evolved over the years into various regional interpretations, but the gin Martini remains the classic definition of this iconic drink.

In contrast, the other options listed do not feature gin as their primary spirit. The Bloody Mary is primarily made with vodka, the Margarita is made with tequila, and the Old Fashioned generally uses bourbon or rye whiskey, highlighting the importance of recognizing the characteristics and base spirits of classic cocktails.