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': 'Brainstem dead are all, except: JIPMER 08 \nSelect and explain. \nA. Weaned off from ventilator, no respiration for 15 sec, B. Absent pupillary response, C. Absent nystagmus, D. Absent corneal reflex', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans.Weaned off from ventilator, no respiration for 15 sec', 'role': 'assistant'}]