<prompt> Oxygen cylinder color:Black body white shoulderWhite body black shoulderBrown body and shoulderBlue body and shoulder  <response>: Ans: a Black body white shoulderRef: Millers Anaesthesia 7th ed. 675GasColor CodePin index positionBodyShoulderOxygenBlackWhite2,5Nitrous oxideBlueBlue3, 5CO2GrayGray1,6HeliumBrownBrown2,5AirGreyWhiteblack quartered1,5 