Which of the following drugs is classified as Schedule I?

Heroin is classified as a Schedule I drug due to its high potential for abuse and the lack of accepted medical use in the United States. Schedule I substances are considered to have no accepted therapeutic value and a significant risk of addiction. This classification is critical as it reflects the law's perspective on public health and safety, emphasizing the dangers associated with its use. In contrast, the other substances listed, such as fentanyl, oxycodone, and hydrocodone, are classified as Schedule II drugs, which means they have accepted medical uses but still carry a high potential for abuse and dependence. Schedule II drugs can be prescribed by licensed medical professionals under strict regulations. This distinction is vital for understanding the different levels of control and regulation surrounding these substances in public health policy.