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': 'Which of the following Mapleson circuit breathing system is used in children? \nSelect and explain. \nA. Mapelson A, B. Mapelson D, C. Mapelson C, D. Ayers T tube', 'role': 'user'}, {'content': 'Answer: D \nExplanation: The Mapleson E (Ayres T piece) breathing system is used in children because it has a very low resistance and minimal dead space. The Mapleson A (Magill) breathing system is efficient for spontaneous ventilation. It is inefficient for controlled ventilation. The Mapleson B and C breathing systems are rarely used for anaesthesia. They are used for resuscitation. The Mapleson D breathing system is inefficient for spontaneous ventilation. It is efficient for controlled ventilation.', 'role': 'assistant'}]