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The correct choice regarding the allowed varieties in Vernaccia di San Gimignano DOCG is the inclusion of up to 10% Chardonnay. This region is renowned primarily for its Vernaccia grape, which is the cornerstone of the DOCG designation. However, the regulations acknowledge the quality and stylistic contributions of other varietals, allowing for a small percentage of Chardonnay to be blended into the wine. This combination helps to enhance the wine's complexity and aromatic profile.

The focus on Vernaccia as the primary grape reflects the appellation's commitment to its traditional identity, while the allowance for Chardonnay provides winemakers with limited flexibility to adapt to modern wine styles and preferences. Thus, the incorporation of a small percentage of Chardonnay is consistent with the overarching goals of preserving the unique characteristics of Vernaccia di San Gimignano, while also permitting some creativity in winemaking.

Other varieties such as Trebbiano and Cabernet Sauvignon are not part of the official blend for this DOCG, which underscores the focus on Vernaccia and its potential while still permitting minimal blending options to enrich the final product.