original question: How many kinds of grapes are permissible in [Gattinara DOCG]?
answer: 2
answer type: Grape Variety.
auxiliary information: Gattinara is a red Italian wine with Denominazione di Origine Controllata e Garantita status produced from Nebbiolo grapes grown within the boundaries of the commune of Gattinara which is located in the hills in the north of the province of Vercelli, northwest of Novara in the Piedmont region. It was awarded DOC status in 1967 and received its DOCG classification in 1990.
How many different kinds of grapes are actually permissible in [Gattinara DOCG]?