Which AC wine is made primarily from Semillon and Sauvignon Blanc, often considered a Bordeaux "copy"?

Monbazillac is made primarily from Semillon and Sauvignon Blanc, which aligns perfectly with the question's criteria. This appellation is located in the southwest of France and is known for producing sweet white wines, often influenced by the noble rot (Botrytis cinerea) that intensifies the flavors. The style of Monbazillac is reminiscent of the famous sweet wines from Bordeaux, particularly those made in Sauternes, leading to its classification as a "Bordeaux copy."

In contrast, Chablis, Madiran, and Cahors are not primarily founded on the same grape varieties. Chablis mainly features Chardonnay and is known for its distinct terroir, producing dry white wines. Madiran is a red wine appellation that typically uses Tannat as the primary grape, along with other indigenous varieties, resulting in bold red wines. Cahors primarily focuses on Malbec, producing deep, tannic reds that are characteristic of the region, making it quite different from the white wines of Monbazillac.