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
The most appropriate circuit for ventilating a spontaneously breathing infant during anaesthesia is – 
Select and explain. 
A. Jackson Rees modification of Ayres T piece, B. Mapleson A or Magill's circuit, C. Mapleson C or Waters to and frocanister, D. Bains circuit
A: Jackson Rees modification of Ayres T piece
Answer: A: Jackson Rees modification of Ayres T piece 
Explanation: The Ayre's T-piece with Jakson-Rees modification remains the mainstay of pediatric anaesthesia.