Question: Grignolino, is a red Italian wine grape variety, commonly grown in the Piedmont region, Grignolino has two "Denominazione di origine controllata" (DOCs) that produce wine from it, Monferrato Casale and Asti, also known as Asti Spumante, is a sparkling white Italian wine that is produced throughout southeastern Piedmont but is particularly focused, around which two towns?
Sentence (from "Cortese"): Significant plantings of Cortese can also be found in the Lombardy region of Oltrepò Pavese and in the DOC white blends of the Veneto wine region of Bianco di Custoza.
Relevant evidence: No