Which of the following is NOT one of the noble hops?

Noble hops are traditional European hop varieties known for their mild and balanced aroma and flavor, often used in lagers and other classic beer styles. The four main noble hop varieties are Hallertau, Tettnanger, Saaz, and Spalt. These hops are characterized by low alpha acid levels and distinct floral, herbal, or spicy aromas, which contribute to a more restrained bitterness in beers.

Cascade is an American hop variety that has been developed more recently. It is known for its higher alpha acids and a citrusy aroma, commonly used in American Pale Ales and IPAs. While Cascade is a popular and widely used hop, it does not fit the profile of noble hops, being too robust and assertive compared to the subtlety typical of the noble varieties. Therefore, it is correct to identify Cascade as the option that is not considered a noble hop.