This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Anaesthetic equipments, Subject name: Anaesthesia
[{'content': 'Anaesthesia breathing circuit recommended for spontaneous breathing is \nSelect and explain. \nA. Mapleson A, B. Mapleson B, C. Mapleson C, D. Mapleson D', 'role': 'user'}, {'content': 'Answer: A \nExplanation: TypeA or Magills circuit is used in Spontaneous ventilation. Type D is used in controlled ventilation. TypeB and Type C are obselete nowadays', 'role': 'assistant'}]