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: Pharmacology
A young man is with known heroin addiction is brought in the emergency in an unconscious state. On examination, the patient has decreased bowel sounds, depressed respiration and pinpoint pupil. The treatment of choice for this patient is 
Select and explain. 
A. Oral naltrexone, B. IV naloxone, C. Oral diazepam, D. Oral Buprenorphine
B: IV naloxone
Answer: B: IV naloxone 
Explanation: None