Which of the following cocktails uses ingredients that include whiskey and bitters?

The Manhattan is a classic cocktail that prominently features whiskey and bitters as key ingredients. Specifically, in a traditional Manhattan, the whiskey is typically rye or bourbon, and it is combined with sweet vermouth and a few dashes of aromatic bitters, resulting in a rich, complex flavor profile. The inclusion of bitters helps to balance the sweetness of the vermouth and enhances the overall depth of the drink.

In contrast, the other cocktails listed do not contain whiskey or bitters. The Adonis, while it may use bitters, does not feature whiskey—rather, it is primarily made with sweet vermouth and dry sherry. The Sidecar is based on brandy or cognac combined with lemon juice and orange liqueur, and the Margarita is known for its tequila base, complemented by lime juice and triple sec. Therefore, the Manhattan stands out as the correct choice because it directly incorporates both whiskey and bitters as essential components.