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': 'Poisoning with all the following causes constriction of the pupils except: \nSelect and explain. \nA. Dhatura, B. Morphine, C. Organophosphorus compounds, D. Pontine hemorrhage', 'role': 'user'}, {'content': 'Answer: A \nExplanation: A i.e. Dhatura In aconite poisoning pupils alternatively contract & dilate (hippus) but remain dilated in later stages.Q In Barbiturate the pupils are constrict but respond to light & in terminal stage becomes dilated.', 'role': 'assistant'}]