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
[{'content': 'Mapelson system used in children is: \nSelect and explain. \nA. Type A, B. Type B, C. Type C, D. Ayers T tube', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Ayers T tube', 'role': 'assistant'}]