This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Autonomic nervous system, Subject name: Pharmacology
[{'content': 'A patient present to emergency with pinpoint pupil, salivation, lacrimation, tremors and red tears. Plasma cholinesterase level was 30% of normal . Most probable diagnosis is \nSelect and explain. \nA. Organophosphate poisoning, B. Datura poisoning, C. Opioid poisoning, D. Pontine haemorrhage', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Refer katzung 12e p110 These are characteristic feature of anticholinesterase(organophosphorous and carbamates) poisoning features of organophosphate poisoning muscarinic symptoms: pinpoint pupil, salivation, lacrimation ,urination,defecation,gastrointestinal distress, vomiting, bronchospasm, bradycardia nicotinic symptoms: fasciculations and fibrillation of muscle, tachycardia and tachypnea CNS symptoms :Tremors, giddiness, ataxia and coma red tears: due to accumulation ofporphyrin in the lacrimal glands', 'role': 'assistant'}]