Which DOCGs are renowned for Sangiovese production?

The choice highlighting Chianti DOCG and Brunello di Montalcino DOCG is correct because both of these designations are specifically known for their high-quality Sangiovese wines.

Chianti DOCG is located in Tuscany and primarily utilizes Sangiovese as its dominant grape variety. The characteristics of Chianti include bright acidity and red fruit flavors, often complemented by herbal and earthy notes, which resonate with the region's climate and terroir.

Brunello di Montalcino DOCG, also situated in Tuscany, is exclusively made from a specific clone of Sangiovese known as Sangiovese Grosso. This wine is known for its full-bodied structure, depth of flavor, and potential for aging. Brunello typically features rich plum, cherry, and earthy undertones, which showcases the grape's versatility and capability to express different facets depending on its terroir.

In contrast, the other choices do not focus on Sangiovese. Barolo and Barbaresco are made primarily from Nebbiolo, while Valpolicella and Amarone della Valpolicella feature Corvina and Rondinella. Montefalco Sagrantino highlights Sagrantino, and Etna Rosso is dominated by Nerello Mas