Which of the following drugs is classified as a Schedule II controlled substance?

Oxycodone is classified as a Schedule II controlled substance due to its high potential for abuse and the risk of severe psychological or physical dependence associated with its use. Schedule II substances have accepted medical uses but carry strict regulatory control because of their addiction potential. Oxycodone, which is often prescribed for managing severe pain, fits this classification precisely due to its efficacy as a potent analgesic along with the necessity for careful prescribing and monitoring.

Other substances listed, such as Xanax (which is a benzodiazepine used for anxiety and is classified as a Schedule IV), Ativan (another benzodiazepine also classified as Schedule IV), and Marijuana (which varies in classification depending on jurisdiction but is often still classified as Schedule I at the federal level), do not have the same level of potential for abuse and dependence as Schedule II drugs. Thus, they do not meet the criteria for this particular classification.