This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Cardiopulmonary Cerebral Resuscitation, Subject name: Anaesthesia
[{'content': 'Clinical criteria of brain death include all except \nSelect and explain. \nA. Coma, B. Absent brainstem reflex, C. Absent spinal reflex, D. Apnea', 'role': 'user'}, {'content': "Answer: C \nExplanation: Brain Death - Clinical Criteria No respiratory effo (apnea) Absent brainstem reflexes Fixed, mid - dilated pupil Absent corneal reflex Absent oculovestibular reflex (Cold caloric) Absent oculocephalic reflex (Doll's eye movement) Absent gag and cough reflex No response to deep central pain", 'role': 'assistant'}]