This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Poisoning, Subject name: Forensic Medicine
[{'content': 'Methadone is used in treatment of overdose of - \nSelect and explain. \nA. Cocaine, B. Heroin, C. Amphetamine, D. Barbiturate', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Heroin/brown sugar Treatment-methadone 40mg daily should be given REF;THE SYNOPSIS OF FORENSIC MEDICINE:KS NARAYANA REDDY;28th EDITION;PAGE NO 337', 'role': 'assistant'}]