Which cocktail contains Chambord as an ingredient?

Chambord is a raspberry liqueur that is commonly used in cocktails to add a rich berry flavor. The French Martini is a cocktail that specifically highlights this ingredient. It typically combines vodka, pineapple juice, and Chambord, creating a beautifully balanced drink that features the sweetness of the raspberry liqueur alongside the tropical notes of pineapple and the smoothness of vodka.

The inclusion of Chambord in the French Martini is what distinguishes it from the other cocktails listed. For instance, the Chocolate Martini focuses on chocolate flavors and typically doesn’t include fruit liqueurs like Chambord. The Sour Apple Martini is based on apple flavors, often featuring sour apple schnapps, and similarly does not incorporate Chambord. The Cosmopolitan, while fruity, is primarily composed of vodka, cranberry juice, triple sec, and lime juice, and it doesn’t utilize Chambord either.

Therefore, Chambord's specific role in the composition of the French Martini confirms it as the correct answer in this context.