This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Anesthesia Machine, Subject name: Anaesthesia
Color of oxygen cylinder is: 
Select and explain. 
A. Black with white color, B. Blue with white color, C. Yellow with white color, D. White
A: Black with white color
Answer: A: Black with white color 
Explanation: ANSWER: (A) Black with white colorREF: Fundamentals of Anesthesia, Tim Smith Colin Pinnock Ted Lin, 3rd Ed, p830SubstanceColour codingCylinderShoulderOxygenblackwhiteNitrous oxideblueblueEntonox gasblueWhite/blueAirblackWhite/blackCarbon dioxidegreygrey