What is the primary component of the Rusty Nail cocktail?

The primary component of the Rusty Nail cocktail is Scotch. This drink is traditionally made by combining Scotch whisky with Drambuie, a sweet Scottish liqueur flavored with herbs and honey. The use of Scotch is essential because it provides the cocktail with its distinctive smoky and rich flavor profile, which complements the sweetness of Drambuie. While other spirits like vodka, rum, and gin are popular in various cocktails, they do not contribute to the unique characteristics of a Rusty Nail. Consequently, the reason Scotch is the correct answer lies in its foundational role in crafting this specific drink, setting the tone for its taste and experience.