<prompt> Brain death criteria include all exceptAbsent corneal reflexAbsent deep tendon reflexesApnea testAbsent oculocelphalic reflex  <response>: 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. 