Which of the following is classified under Schedule III?

To understand why "none of the above" is the correct classification for Schedule III substances, it is essential to consider the characteristics of the individual options listed.

Schedule III drugs are those that have a moderate to low potential for physical and psychological dependence. They are recognized for having accepted medical uses in the United States but may lead to moderate or low physical dependence or high psychological dependence.

Peyote is classified under Schedule I because it contains mescaline, which has a high potential for abuse and is not accepted for medical use in the U.S. Cocaine is categorized as a Schedule II drug due to its high potential for abuse, although it has accepted medical applications as a local anesthetic. MS Contin, which is a brand name for a formulation of morphine, is also classified as Schedule II, as it is an opioid and carries a significant risk for abuse and dependence.

Given that all the listed substances fall into categories other than Schedule III, the conclusion is evident that none of the options provided are classified under Schedule III, making the choice of "None of the above" appropriate. Understanding these classifications is crucial for identifying how different substances are regulated in the context of their potential for abuse and medical utility.