Which of the following grapes is a white grape from Tuscany?

Vernaccia is indeed a white grape variety that is famously associated with Tuscany, particularly in the San Gimignano region. It is known for producing dry white wines that often exhibit bright acidity and flavors of citrus and minerals. The grape has a long history in Tuscany and is recognized for its ability to reflect the terroir of the region, making it an essential part of Tuscan viticulture.

In contrast, Sangiovese is a red grape variety, well-loved in Tuscany, especially in renowned wines like Chianti. Nero d'Avola, also a red grape, originates from Sicily and is known for its bold and fruity characteristics. Cabernet Sauvignon is another red grape, primarily associated with regions such as Bordeaux in France and Napa Valley in California, rather than being a staple in Tuscany. Each of these non-white varieties contributes to the richness of Italian wine but does not share the same white varietal classification as Vernaccia.