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: Physiology
[{'content': "Cushing's triad includes all except: \nSelect and explain. \nA. Hypertension, B. Bradycardia, C. Tachycardia, D. Irregular respiration", 'role': 'user'}, {'content': "Answer: C \nExplanation: Cushing's Triad:\nHypertension, bradycardia and irregular respiration form the Cushing triad.\nIt’s a protective reflex to overcome the CNS ischemic response due to an increase in CSF\xa0pressure. This reflex leads to increase in arterial pressure above the CSF and blood flows once again into blood vessels of the brain\xa0to relieve ischemia. This increase in arterial pressure (hypertension) causes reflex bradycardia.\nReference: Ganong’s Review of Medical Physiology T W E N T Y - F I F T H\xa0 \xa0E D I T I O N page no 593", 'role': 'assistant'}]