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
A patient presents to emergency with the pinpoint pupil, salivation lacrimation, tremors, and red tears. Plasma cholinesterase level Was 30% of normal. Most probable Diagnosis is: 
Select and explain. 
A. Organophospahte Poisoning, B. Dhatura Poisoning, C. Opioid Poisoning, D. Pontine hemorrhage
A: Organophospahte Poisoning
Answer: A: Organophospahte Poisoning 
Explanation: ref: KD Tripathi 7th edition (105,110),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 svmptoms: Temors, giddiness, ataxia, coma Red tears: Due to accumulation of porphyrin in the lacrimal glands