This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Labour - III, Subject name: Gynaecology & Obstetrics
Which of the following drug must always be available for emergency use in labour ward if a patient on opoid analgesia? 
Select and explain. 
A. Fentanyl, B. Naloxone, C. Morphine, D. Bupivacaine
B: Naloxone
Answer: B: Naloxone 
Explanation: Opoids are used during labor for analgesia. It may cause newborn respiratory depression. Naloxane is a narcotic antagonist capable of reversing this respiratory depression