Which of the following substances is included in opioid treatment options?

The correct choice refers to capsules, which can contain various forms of opioid medications used for pain management and treatment of other medical conditions. Opioids are a class of drugs that include both prescription medications, such as morphine and oxycodone, and illegal drugs, such as heroin. In the context of treatment options, capsules are a common pharmaceutical form for delivering opioid medications, allowing for controlled dosage and administration.

Heroin, while it is an opioid, is illegal and associated with high risk of addiction and overdose, which makes it inappropriate as a treatment option. Hallucinogens are a separate class of substances that alter perception and mood but do not include opioid properties. Cocaine is a stimulant and also not related to opioid treatment; it functions differently in the body and is not used for managing pain in the same way that opioids are.

Thus, capsules being a legitimate form of opioid medication aligns with the proper context of treatment options in managing pain or opioid dependence.