Which Grand Cru property in Cote d'Or has never been parceled out?

Clos de Tart is the correct answer because it is unique among Burgundy's Grand Cru vineyards in that it has never been divided into smaller plots owned by different producers. This single ownership has allowed the property to maintain a consistent identity and reputation over the years. The vineyard is situated within the Côte de Nuits and is renowned for producing high-quality Pinot Noir.

In contrast, other Grand Cru properties like Chambertin, La Tâche, and Bonnes Mares have experienced parceling out over time, leading to various owners managing distinct sections. This division can affect the consistency and character of the wines produced from these vineyards, as different producers may implement different viticultural practices and winemaking techniques. Clos de Tart's uninterrupted ownership contributes to its status and the ability to produce wine that reflects the terroir in a more unified manner.