This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Anaesthesia, Subject name: Pharmacology
A farmer is found convulsing in the farm. Diarrhea, sweating and urination are apparent. Pupils are pin point. Drug poisoning is suspected. Most probable cause is: 
Select and explain. 
A. Acetaminophen overdose, B. Amphetamine toxicity, C. Organophosphate poisoning, D. Atropine poisoning
C: Organophosphate poisoning
Answer: C: Organophosphate poisoning 
Explanation: Ans. C. Organophosphate poisoningThese are characteristic features of anti-cholinesterase (organophosphate and carbamate) poisoning.A. Symptom due to muscarinic actions: (DUMBELS)* Diarrhoea, Diaphoresis* Urination* Miosis* Bronchoconstriction* Excitation CNS* Lacrimation,* SalivationB. Symptom due to nicotinic action:Skeletal muscle fasciculations, weakness leading to (diaphragmatic) paralysis and deathTwo kinds of poisonings result in pin point pupil i.e. Opioids Poisoning and Organophosphate Poisoning