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: Anaesthesia
Best antagonist of morphine is 
Select and explain. 
A. Nalorphine, B. Naloxone, C. Buprenorphine, D. Pentazocine
B: Naloxone
Answer: B: Naloxone 
Explanation: B i.e. Naloxone