What are the two key white grape varieties of Touraine?

In the Touraine region of the Loire Valley in France, the two key white grape varieties are indeed Chenin Blanc and Sauvignon Blanc. Chenin Blanc is particularly significant in this region, as it is renowned for its versatility and can be made into a wide range of styles, from dry to sweet, and even sparkling wines. This grape thrives in the region's varied terroir and contributes to the unique expression of the wines produced there.

Sauvignon Blanc, on the other hand, is another major variety in Touraine, often producing fresh, aromatic wines that showcase notes of citrus, green apple, and herbal characteristics. The combination of these two grapes not only defines the quality and style of the white wines from Touraine but also reflects the influence of the region's climate and soil types.

The other options, while they may include grapes that are important in other regions, do not accurately represent the primary white varieties in Touraine. For example, Pinot Grigio is not typically associated with this area, and neither are Chardonnay, Riesling, Semillon, or Muscat. Thus, the distinction of Chenin Blanc and Sauvignon Blanc as the primary white grapes in Touraine underscores the unique viticultural identity of this region in the Loire Valley.