<prompt> Which of the following Mapleson circuit breathing system is used in children?Mapelson AMapelson DMapelson CAyers T tube  <response>: 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. 