Which DOC in Italy produces wines made from the Verdicchio grape?

The choice is correct because Verdicchio dei Castelli di Jesi DOC is renowned for producing wines exclusively from the Verdicchio grape. This denomination is located in the Marche region of Italy and is celebrated for its crisp, refreshing white wines that often display characteristics such as green apple, citrus, and herbal notes. Additionally, the DOC has specific regulations that mandate the use of Verdicchio as the primary grape, promoting the uniqueness and integrity of the varietal.

In contrast, the other options involve different grape varieties. Soave DOC primarily produces wines from the Garganega grape, Gavi DOCG focuses on the Cortese variety, and Fiano di Avellino DOCG is exclusively based on the Fiano grape. Therefore, Verdicchio dei Castelli di Jesi DOC stands out as the sole DOC listed that emphasizes the Verdicchio grape, underscoring its significance within Italian wine production.