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
Cushing's triad includes all except: 
Select and explain. 
A. Hypertension, B. Bradycardia, C. Tachycardia, D. Irregular respiration
C: Tachycardia
Answer: C: Tachycardia 
Explanation: Cushing's Triad:
Hypertension, bradycardia and irregular respiration form the Cushing triad.
It’s a protective reflex to overcome the CNS ischemic response due to an increase in CSF pressure. This reflex leads to increase in arterial pressure above the CSF and blood flows once again into blood vessels of the brain to relieve ischemia. This increase in arterial pressure (hypertension) causes reflex bradycardia.
Reference: Ganong’s Review of Medical Physiology T W E N T Y - F I F T H   E D I T I O N page no 593