What is the main citrus component in a Cosmopolitan cocktail?

In a Cosmopolitan cocktail, lime juice is the primary citrus component. This tart and zesty flavor is critical in balancing the sweetness from the cranberry juice and the other ingredients, typically vodka and triple sec. Lime juice contributes to the overall brightness and freshness of the cocktail, making it a popular choice among cocktails that emphasize citrus elements.

While other options like lemon juice and orange juice are citrus juices, they are not typically included in a Cosmopolitan recipe. Lemon juice could provide a similar tartness but does not capture the distinctive flavor profile that lime juice brings to this cocktail. Orange juice, while a common mixer in many drinks, diverges from the intended flavor of the Cosmopolitan. Cranberry juice is an essential part of the cocktail, but it is not a citrus fruit; rather, it's primarily for sweetness and color. Thus, lime juice stands out as the correct answer, accentuating the drink's signature taste.