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': 'Pin point pupil is seen in A/E : \nSelect and explain. \nA. Pontine haemorrhage, B. Organophosphorus poisoning, C. Opium poisoning, D. Barbiturate poisoning', 'role': 'user'}, {'content': 'Answer: D \nExplanation: D i.e. Barbiturate All are causes of constricted pupils but in? Barbiturate poisoning the pupils are usually slightly constricted & react to light by alternate contraction & dilation and dilate during terminal asphyxiaQ', 'role': 'assistant'}]