Final answer:
The claim is true; only blue agave is allowed in the production of Tequila, conforming to strict Mexican regulations.
Step-by-step explanation:
The statement that the only agave allowed in any form of Tequila is the blue agave is True. Tequila is a distilled alcoholic beverage made primarily in the area surrounding the city of Tequila, Mexico. To be legally classified as Tequila, the spirit must be produced from the blue agave plant (Agave tequilana), specifically the Weber Blue variety. The Mexican government and Tequila regulations (NOM) have strict standards that define Tequila, and one of the primary rules is that it must be made with at least 51% of sugars from the blue agave plant. There are other types of agave plants, but these are used for different spirits like Mezcal. In contrast, Tequila is uniquely tied to the blue agave.