This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Anaesthetic Equipments, Subject name: Anaesthesia
PIN number of nitrous oxide is: 
Select and explain. 
A. 2, 5, B. 3, 5, C. 2, 6, D. 3, 6
B: 3, 5
Answer: B: 3, 5 
Explanation: Ans: b (Nitrous oxide)Pin index for gasesOxygen-2,5Nitrous oxide-3,5Cyclopropane-3,6Air-1,5Nitrogen-1,4