This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Opioids and Alcohols, Subject name: Pharmacology
Which of the following drugs reduces alcohol craving and chances of resumed heavy drinking by alcoholics after they have undergone a detoxification programme with this drug? 
Select and explain. 
A. Chlordiazepoxide, B. Chlorpromazine, C. Methadone, D. Naltrexone
D: Naltrexone
Answer: D: Naltrexone 
Explanation: Drugs decreasing alcohol craving are; None: Naltrexone Of: Ondansetron The: Topiramate Above: Acamprosate