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: Pharmacology
[{'content': 'A patient presents to emergency with a pinpoint pupil, salivation, lacrimation, tremors and red tears. Plasma cholinesterase level was 30% of normal. Most probable Diagnosis is: \nSelect and explain. \nA. Organophospahte poisoning, B. Dhatura poisoning, C. Opioid poisoning, D. Pontine hemorrhage', 'role': 'user'}, {'content': 'Answer: A \nExplanation: The given features are those of anticholinesterase.\nAcetylcholinesterase causes inactivation of acetylcholine after its action at neuromuscular junctions. When this is blocked, there is the higher action of acetylcholine, which shows as increased parasympathetic activity.\nAnticholinesterase activity is seen in Organophosphate poisoning.', 'role': 'assistant'}]