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
In magil circuit airflow is – 
Select and explain. 
A. 1/2 of minute volume, B. equal to M.V., C. 2 x m.v., D. 3 x m.v.
B: equal to M.V.
Answer: B: equal to M.V. 
Explanation: "For Mapleson Type A (Magill) circuit fresh gas flow should be equal to minute volume (5 L/min) to prevent rebreathing when patient is spontaneously breathing".