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: Psychiatry
Which of the following is the drug of choice for opioid overdose 
Select and explain. 
A. Clonidine, B. Naloxone, C. Buprenorphine, D. Flumazenil
B: Naloxone
Answer: B: Naloxone 
Explanation: Naloxone is a central opioid antagonist given intravenously in opioid drug poisoning.