Which of the following is considered a narcotic?

Hydromorphone is indeed considered a narcotic because it is an opioid analgesic used to treat severe pain. It acts on the body's opioid receptors, which play a crucial role in pain modulation. Hydromorphone is legally categorized as a Schedule II controlled substance due to its high potential for abuse and dependence, which is characteristic of narcotics.

Alternatively, the other substances listed do not fit the definition of narcotics in the same way. Hydroxybutyric Acid, commonly known as GHB, has sedative and anesthetic effects but is not classified as a narcotic. Cocaine is a powerful stimulant with local anesthetic properties and is not categorized as a narcotic. Lysergic Acid Diethylamide (LSD) is a hallucinogenic drug that alters perception and does not possess the pain-relieving properties associated with narcotics. Understanding these distinctions is essential for recognizing the various classifications of drugs and how they affect the body.