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': 'In magil circuit airflow is – \nSelect and explain. \nA. 1/2 of minute volume, B. equal to M.V., C. 2 x m.v., D. 3 x m.v.', 'role': 'user'}, {'content': 'Answer: B \nExplanation: "For Mapleson Type A (Magill) circuit fresh gas flow should be equal to minute volume (5 L/min) to prevent\xa0rebreathing when patient is spontaneously breathing".', 'role': 'assistant'}]