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: Forensic Medicine
[{'content': 'A patient was brought with a history of pyrexia, contracted pupils, hypotension, cyanosis, progressing to coma is suspected to be suffering from poisoning due to \nSelect and explain. \nA. Diphenhydramine, B. Cannabis, C. Dhatura, D. Phenobarbitone', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Pyrexia + contracted pupils = Phenobarbitone poisoning Pyrexia + dilated pupils = Datura poisoning Constriction of the pupils (miosis) is typical of opioids, clonidine, phenothiazines, and cholinesterase inhibitors (eg, organophosphate insecticides), and deep coma due to sedative drugs.(Phenobarbitone) Ref: Krishan Vij textbook of forensic medicine, 5th edition pg : 508', 'role': 'assistant'}]