This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Anaesthesia
Colour of oxygen cylinder is – 
Select and explain. 
A. Grey, B. Blue, C. Black with white shoulder, D. Orange
C: Black with white shoulder
Answer: C: Black with white shoulder 
Explanation: Oxygen cylinder has black body with white shoulder.