This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Breathing Systems, Subject name: Anaesthesia
[{'content': 'Mapelson circuit used in children is? \nSelect and explain. \nA. Mapelson A, B. Mapelson D, C. Mapelson C, D. Ayers T tube', 'role': 'user'}, {'content': 'Answer: D \nExplanation: ANSWER: (D) Ayers T tubeREF: Morgan\'s Anesthesia 3R" edition p. 30ANESTHETIC GAS DELIVERY:SPONTANEOUS BREATHINGIPPVPOST OPERATIVEMAPELSON AMapelson-DMapelson-EMapelson C or WATER\'SAdultsBain\'s coaxialAyer\'s t tubesystemFlow rate- 51/minMeant for infants and childrenFlow rate-2-3 x min. volumeEqual to minute volume', 'role': 'assistant'}]