This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Pharmacology
Drugs that can be used in opioid de–addiction are ? 
Select and explain. 
A. Clonidine, B. Diazepam, C. Methadone, D. All of the above
D: All of the above
Answer: D: All of the above 
Explanation: None