This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Central Nervous system, Subject name: Pharmacology
[{'content': 'A young man is with known heroin addiction is brought in the emergency in unconscious state. On examination, the patient has decreased bowel sounds, depressed respiration and pin point pupil. The treatment of choice for this patient is \nSelect and explain. \nA. Oral natrexone, B. IV naloxone, C. Oral diazepam, D. Oral Buprenorphine', 'role': 'user'}, {'content': 'Answer: B \nExplanation: IV Naloxone 0.1-0.4 mg . Dose repeated every 1-2 hour as naloxone is sho acting. As patient is unconscious drug cannot be given orally. Ref: KD Tripathi 8th ed.', 'role': 'assistant'}]