Which of the following is NOT considered a sparkling wine?

Sherry is a fortified wine from the Jerez region in Spain and is known for its unique production process and flavor profile, but it does not undergo the secondary fermentation that creates the bubbles characteristic of sparkling wines. In contrast, Cava, Prosecco, and Champagne are all types of sparkling wine, each produced through methods that result in effervescence. Cava is primarily made using the traditional method in Spain, Prosecco is made from the Glera grape and typically employs the tank method for its carbonation, and Champagne is produced in the Champagne region of France, recognized for its high-quality sparkling wines through the traditional method. Therefore, Sherry stands out as the option that does not belong among sparkling wines.