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
The plane of surgical anesthesia during ether anesthesia is defined as 
Select and explain. 
A. 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
C: From onset of regular respiration to cessation of spontaneous breathing
Answer: C: From onset of regular respiration to cessation of spontaneous breathing 
Explanation: 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