This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: A.N.S., Subject name: Pharmacology
[{'content': 'A patient presents 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 hemorrhage', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans. (A) Organophosphate poisoning(Ref: Katzung 12/e p110)These are characteristic features of anti-cholinestearse (organophosphate and carbamate) poisoning.Features of Organophosphate poisoning:* Muscarinic symptoms: Pin point pupil, salivation, lacrimation, urination, defecation, gastrointestinal distress, vomiting, bronchospasm, bradycardia* Nicotinic symptoms: Fasciculations and fibrillations of muscle, tachycardia, tachypnea* CNS symptoms: Temors, giddiness, ataxia, coma* Red tears: Due to accumulation of porphyrin in the lacrimal glands', 'role': 'assistant'}]