Which grape variety is known for thriving in limestone-rich soils in Italy?

Cortese is recognized for thriving in limestone-rich soils, particularly in the region of Piedmont, Italy. This grape variety is best known for its application in producing Gavi, a white wine that exhibits crisp acidity and floral, mineral nuances. The limestone in the soil contributes to the grape's ability to retain acidity, which is crucial for the freshness and balance of the resulting wines.

While other varieties like Sangiovese, Barbera, and Nebbiolo can also be found in various soil types and regions, they do not have the same established association with limestone-rich soils as Cortese does. Sangiovese is more commonly linked to clay and sandy soils, Barbera thrives in a mix of soils but is adaptable, and Nebbiolo, which can also benefit from limestone, often prefers more varied geological compositions which include clay and sandy soils as well. Thus, Cortese is the best answer in the context of its relationship with limestone-rich environments.