Which of the following is NOT a key wine region in Castilla-La Mancha?

The region of Rueda DO is primarily known for its white wines, particularly those made from the Verdejo grape, and is not classified under the key wine regions of Castilla-La Mancha. Instead, Rueda lies to the northwest of Castilla-La Mancha, in the autonomous community of Castile and León.

In contrast, La Mancha DO, Valdepeñas DO, and VdlT de Castilla are all important wine regions within Castilla-La Mancha. La Mancha DO covers a significant portion of the region and is one of the largest wine-producing areas in Spain, known for both red and white wines. Valdepeñas DO, located to the south of Madrid, is recognized for its quality, particularly of Tempranillo. VdlT de Castilla allows for a variety of grapes and wines, and while it may not have a specific designation like a DO, it still represents a notable segment of the wine production in the area.

Understanding these classifications is essential when discussing Spanish wines and the geographical contexts in which they are produced.