This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Poisoning, Subject name: Anatomy
[{'content': "McEwan's pupil is seen in \nSelect and explain. \nA. Opioid poisoning, B. Mercury poisoning, C. Alcohol poisoning, D. Chronic lead poisoning", 'role': 'user'}, {'content': "Answer: C \nExplanation: Stage of coma in ethyl alcohol poisoning The person may go to a stage of coma at a blood alcohol concentration of more than 300mg%. There will be steorous breathing. The pulse is rapid and temperature is subnormal. Pupils remaining constricted. On slapping or pinching on the face, causes pupils to dilate and gradually return to constriction (McEwan's pupils) ref: FORENSIC MEDICINE AND TOXICOLOGY Dr PC IGNATIUS THIRD EDITION PAGE 437", 'role': 'assistant'}]