This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General obstetrics, Subject name: Anatomy
Which of the drugs must be available in labour room while giving narcotics for pain? 
Select and explain. 
A. Fentanyl, B. Naloxone, C. Pheniramine, D. Morphine
B: Naloxone
Answer: B: Naloxone 
Explanation: In a labour room when opoid narcotics are being given to reverse the respiratory depression induced by them, Naloxone should be available. It is given to the mother 0.4 mg IV in labour. Ref: Datta Obs 9e pg 479.