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: Forensic Medicine
Methadone is used to treat withdrawal symptoms of: PGI 12; NEET 13 
Select and explain. 
A. Cocaine, B. Heroin, C. Amphetamine, D. Barbiturate
B: Heroin
Answer: B: Heroin 
Explanation: Ans. Heroin