**Core Concept**
The treatment of opioid dependence involves a comprehensive approach that includes pharmacological interventions, behavioral therapies, and support services. Medications like methadone, buprenorphine, and naltrexone are used to manage withdrawal symptoms, cravings, and prevent relapse.

**Why the Correct Answer is Right**
Methadone is a long-acting opioid agonist that helps reduce withdrawal symptoms and cravings by activating the mu-opioid receptors in the brain. It is commonly used in opioid maintenance therapy (OMT) to stabilize individuals with opioid use disorder. Methadone works by reducing the severity of withdrawal symptoms, making it easier for patients to manage their cravings and reintegrate into society.

**Why Each Wrong Option is Incorrect**
* **Option A:** This option is incorrect because it does not specify a medication or treatment approach for opioid dependence. While counseling and support services are essential components of opioid treatment, they are not sufficient as standalone treatments.
* **Option B:** This option is incorrect because naltrexone is an opioid antagonist, not an agonist. While it can be used to treat opioid dependence, it is more suitable for individuals who have already achieved a period of abstinence and are at risk of relapse.
* **Option C:** This option is incorrect because buprenorphine is a partial opioid agonist, not a full agonist like methadone. While buprenorphine is effective in managing withdrawal symptoms and cravings, it has a ceiling effect, which means it does not produce the same level of euphoria as full opioid agonists.

**Clinical Pearl / High-Yield Fact**
Methadone maintenance therapy (MMT) is a highly effective treatment for opioid dependence, with studies showing a significant reduction in mortality rates, overdose-related hospitalizations, and crime rates among patients receiving MMT.

**Correct Answer: A. Methadone**