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
Which of the following Mapleson circuit breathing system is used in children? 
Select and explain. 
A. Mapelson A, B. Mapelson D, C. Mapelson C, D. Ayers T tube
D: Ayers T tube
Answer: D: Ayers T tube 
Explanation: 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.