Name the primary white grape variety used in Champagne production.

The primary white grape variety used in Champagne production is Chardonnay. Champagne production is distinct because it is governed by strict regulations concerning the grape varieties that can be utilized, and Chardonnay is one of the key grapes, alongside Pinot Noir and Pinot Meunier.

Chardonnay contributes to the elegance and finesse of Champagne, providing acidity and subtle fruit flavors that are essential for the development of complexity in sparkling wines. It is particularly valued for its ability to age well, which is important in the traditional method of Champagne production, where the wine undergoes secondary fermentation in the bottle. This grape is known for its versatility across different terroirs within the Champagne region, enhancing the overall flavor profile of the finished product.

Other grape varieties mentioned, such as Pinot Grigio, Sauvignon Blanc, and Riesling, while popular in their own respective wine-making regions and styles, are not utilized in traditional Champagne production, making them unsuitable choices in this context.