What defines a cocktail known as a "fizz"?

A cocktail known as a "fizz" is specifically defined by its use of carbonation, which is typically achieved through the inclusion of a carbonated beverage such as soda water. Additionally, a key characteristic of a fizz is the inclusion of citrus juice, which adds a bright and refreshing flavor to the drink. This combination not only gives the drink its signature effervescence but also balances sweetness with acidity, creating a well-rounded taste profile.

Other options describe different types of cocktails that do not align with the fizz's typical characteristics. For example, a stirred cocktail served straight would be indicative of drinks like martinis or Manhattans, and a cocktail served in a martini glass is typically not associated with the fizz category. Similarly, cocktails containing cream refer to a different category, such as creamy cocktails or dessert drinks, which lack the bubbly nature of a fizz. Understanding these distinctions helps clarify what makes a fizz unique compared to other cocktail styles.