Which ingredients are used in a classic Sidecar cocktail?

The classic Sidecar cocktail is primarily made with Cognac, which provides its rich depth, along with lemon juice for a bright acidity that balances the sweetness. The use of triple sec (or orange liqueur) adds a layer of sweetness and a hint of orange flavor that complements the other ingredients. This combination creates a well-rounded cocktail that is both refreshing and sophisticated.

In contrast, the other options present combinations that do not align with the traditional recipe for a Sidecar. The use of vodka, gin, rum, or different juice combinations leads to variations that are not recognized as the classic Sidecar. Only the correct option combines the expected base spirit and liqueur with the appropriate citrus element, making it authentic to the traditional cocktail.