This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Anaesthetic equipments, Subject name: Anaesthesia
For high pressure Storage of compressed gases cylinders are made up of 
Select and explain. 
A. Molybdenum steel, B. Iron + Mo, C. Steel + Cu, D. Cast iron
A: Molybdenum steel
Answer: A: Molybdenum steel 
Explanation: To withstand high pressure cylinders are made up of molybdenum and steel.