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
[{'content': 'For high pressure storage of compressed gases cylinders are made up of. \nSelect and explain. \nA. Molybdenum steel, B. Iron + Mo, C. Steel + Cu, D. Cast iron', 'role': 'user'}, {'content': 'Answer: A \nExplanation: A i.e. Molybdenum Steel', 'role': 'assistant'}]