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: Psychiatry
Opiate withdrawl is treated with 
Select and explain. 
A. CPZ, B. Nalorphine, C. Pethidine, D. Methadone
D: Methadone
Answer: D: Methadone 
Explanation: D i.e. Methadone