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
Drugs used in maintenance of substance dependance: 
Select and explain. 
A. Clonidine, B. Acamprosate, C. Disulfiram, D. All
D: All
Answer: D: All 
Explanation: A i.e. Clonidine; B i.e. Acamprosate; C i.e. Disulfiram