Which of the following is a Schedule IV controlled substance?

Hydrocodone is classified as a Schedule II controlled substance, indicating a higher potential for abuse and dependence. It is often prescribed for severe pain management and is more strictly regulated than Schedule IV substances, which are considered to have a lower risk of addiction.

Oxycodone is also categorized as a Schedule II controlled substance. Similar to hydrocodone, it is used for pain relief but has a significant potential for abuse, leading to stricter regulations and monitoring compared to Schedule IV drugs.

Morphine is classified as a Schedule II controlled substance as well. It is a powerful opioid used for pain management and carries a high risk of addiction and abuse, which necessitates stringent regulatory controls that are not applicable to Schedule IV substances like diazepam.