This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Local and Regional Anesthesia, Subject name: Anaesthesia
Oxygen cylinder color: 
Select and explain. 
A. Black body white shoulder, B. White body black shoulder, C. Brown body and shoulder, D. Blue body and shoulder
A: Black body white shoulder
Answer: A: Black body white shoulder 
Explanation: Ans: (a) Black body white shoulderRef: Miller's Anaesthesia 7th ed. / 675GasColor CodePin index positionBodyShoulderOxygenBlackWhite2,5Nitrous oxideBlueBlue3, 5CO2GrayGray1,6HeliumBrownBrown2,5AirGreyWhite/black quartered1,5