This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Anesthesia, Subject name: Pharmacology
[{'content': 'The plane of surgical anesthesia during ether anesthesia is defined as \nSelect and explain. \nA. Loss of consciousness, B. Loss of consciousness to the onset of spontaneous respiration, C. From onset of regular respiration to cessation of spontaneous breathing, D. Absence of reflexes', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Refer KDT 7th/373 The plane of surgical anesthesia during ether anesthesia is defined as from onset of regular respiration to cesssation of spontaneous breathing', 'role': 'assistant'}]