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
Mapelson circuit used in children is? 
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: 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