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
True about anaesthesia breathing circuit is 
Select and explain. 
A. Cylinder is a pa of high pressure system, B. Oxygen flush delivers less than 35 litres, C. Oxygen flush delivers more than 135 litres, D. Pipelines is a pa of low pressure system
A: Cylinder is a pa of high pressure system
Answer: A: Cylinder is a pa of high pressure system 
Explanation: Cylinders -High pressure system Pipelines -Intermediate pressure system Oxygen Flush delivers 30 to 75lts and it is a pa of intermediate pressure system