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': 'Clinical criteria of brain death is all except – \nSelect and explain. \nA. Coma, B. Absent brain stem reflex, C. Absent spinal cord reflex, D. Absent motor activity', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Spinal cord reflexes may be preserved.', 'role': 'assistant'}]