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
A 35 year old man was found unconscious. Examination revealed bilateral constricted pupils, bradycardia, excessive sweating and secretion. Most likely cause is: 
Select and explain. 
A. Opium poisoning, B. Acute alcohol intoxication, C. Organophosphorous poisoning, D. Pontine hemorrhage
C: Organophosphorous poisoning
Answer: C: Organophosphorous poisoning 
Explanation: None