This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Anaesthesia, Subject name: Pharmacology
Color of oxygen cyclinder is? 
Select and explain. 
A. Black body with white shoulder, B. Black body with grey shoulder, C. Grey body with white shoulder, D. Grey body with black shoulder
A: Black body with white shoulder
Answer: A: Black body with white shoulder 
Explanation: Ans. (A) Black body with white shoulder(Ref: Anesthetic Equipments & Procedures, Practical Approach/p37, 38;)The color of a medical oxygen cylinder is a black body with a white shoulder.Medical GasColourOxygenBlack body with white shoulderCarbon dioxideGreyNitrous oxideBlueCyclopropaneOrangeHeliumBrownEntonoxBlue body with white shoulder