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
Sunder Lal, 28 year old farmer is found convulsing in the farm. Heart rate is 100/min and blood pressure is 180/110 mm Hg. 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: All the given symptoms are due to anticholinesterase action.