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: Anaesthesia
[{'content': 'Criteria for brain death A/E – a) ECGb) EEGc) Brain stem reflexd) ↓body temperaturee) Pupillary dilatation \nSelect and explain. \nA. abcd, B. bcde, C. abde, D. ade', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Criteria for brain death contain three essential elements :-\n\n\nWidspread cortical destruction that is reflected by deep coma and unresponsiveness to all forms of stimuli (absence of motor activity).\nGlobal brainstem damage demonstrated by absent papillary light reaction and by the loss oculovestibular and corneal reflexes.\nDestruction of medulla demonstrated of complete apnea.\n\n\nAbsent EEG and pupillary dilatation are seen in brain death, However they are not included in the clinical criteria for brain death diagnosis.', 'role': 'assistant'}]