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
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 
Select and explain. 
A. Diphenhydramine, B. Cannabis, C. Dhatura, D. Phenobarbitone
D: Phenobarbitone
Answer: D: Phenobarbitone 
Explanation: 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