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-a) Naloxoneb) Acamprosatec) Disulfiramd) Clonidine 
Select and explain. 
A. abc, B. acd, C. bcd, D. bd
C: bcd
Answer: C: bcd 
Explanation: Maintenance drugs in opioid dependence: - Methadone, buprenorphine, LAAM, Naltrexone, Clonidine with naltrexone.
Maintenance drugs in alcohol dependence: - Aversive drugs (disulfiram, CCC, metranidazole, nitrafezole), and anticraving agents (Naltrexone, acamprosate, fluoxetine, topiramate, nalmefene.