This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Pharmacology
Which nonopioid medication can be used to treat some of the symptoms of opioid withdrawal syndrome? 
Select and explain. 
A. Chlordiazepoxide, B. Haloperidol, C. Methadone, D. Clonidine
D: Clonidine
Answer: D: Clonidine 
Explanation: Clonidine, Alpha 2 receptor agonist, is used to suppress some of the symptoms of mild opioid withdrawal. Clonidine is paicularly useful in the detoxification of patients maintained on methadone.