This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Miscellaneous, Subject name: Anaesthesia
Brain death criteria include all except 
Select and explain. 
A. Absent corneal reflex, B. Absent deep tendon reflexes, C. Apnea test, D. Absent oculocelphalic reflex
B: Absent deep tendon reflexes
Answer: B: Absent deep tendon reflexes 
Explanation: (B) Absent deep tendon reflexes # BRAIN DEATH is present when there is irreversible loss of all brain function, both brain-stem function and cortical (hemisphere) function.> Brain death criteria -- Loss of brainstem function & Absent cranial nerve reflexes - Pupillary light reflex; Corneal reflex; Oculo vestibular reflex (cold caloric test; No gag reflex)> Absent respiratory brain stem reflexes is done by Apnea test: Loss of cortical function (No spontaneous movement; no response to external stimuli); Irreversibility.> The absence of deep tendon reflexes is not required because the spinal cord may remain functional.> The pulse rate is also invariant and unresponsive to atropine.