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: Forensic Medicine
[{'content': 'Not a feature of brain death - \nSelect and explain. \nA. Complete apnea, B. Absent pupillary reflex, C. Absent deep tendon reflex, D. Heart rate unresponsive to atropine', 'role': 'user'}, {'content': 'Answer: C \nExplanation: The absence of deep tendon reflexes is not required to diagnose brain death because the spinal cord may remain functional.', 'role': 'assistant'}]