Which cocktail is made using Southern Comfort as a primary spirit?

The Southern Comfort Manhattan is the cocktail that specifically uses Southern Comfort as a primary spirit. Southern Comfort is a fruit-flavored whiskey liqueur that has a unique flavor profile, setting it apart from traditional whiskey or bourbon. In the Southern Comfort Manhattan, this liqueur is combined with sweet vermouth and often garnished with a cherry, creating a drink that showcases the sweet and fruity notes of Southern Comfort while still maintaining the essence of a classic Manhattan.

Other cocktails listed do not utilize Southern Comfort as a base. For instance, a Rob Roy is typically made with Scotch whiskey, while a Gibson is a variation of the classic martini using gin and served with a cocktail onion instead of the traditional olive. A Vodka Martini solely relies on vodka as its base spirit, making it unrelated to Southern Comfort entirely. Thus, the Southern Comfort Manhattan distinctly highlights the unique flavor of the Southern Comfort, making it the correct choice in this context.