This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Miscellaneous, Subject name: Medicine
[{'content': 'Colour coding for Nitrous oxide cylinder is \nSelect and explain. \nA. Black, B. Black with white shoulders, C. French blue, D. Gray', 'role': 'user'}, {'content': 'Answer: C \nExplanation: (C) French blue IDENTIFICATION OF MEDICAL GAS CYLINDERSGasColor of cylinderPressure at 15degC when full British standard (Body/Shoulder)United StatesLbf/in2Bar1. Oxygen (O2)Black / WhiteGreen19871372. Nitrous oxide (N2O)French blueBlue638443. CyclopropaneOrangeOrange7354. Carbondioxide (CO2)GreyGrey725505. Helium (He)BrownBrown19871376. AirGreyYellow19871377. O^HeliumBlackGreen/Brown19871378. OJC02BlackGreen/Grey19871379. EntonoxBlueBlue/Green1987137', 'role': 'assistant'}]