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
35 year old man was found unconscious. Examination revealed bilateral constricted pupil, bradycardia, excessive sweating and secretion. most likely causes 
Select and explain. 
A. Opium poisoning, B. Acute alcohol intoxication, C. Organophosphorus poisoning, D. Pontine haemorrhage
C: Organophosphorus poisoning
Answer: C: Organophosphorus poisoning 
Explanation: Refer kDT 7/e p 110,111 Signs and Symptoms Muscarinic signs (SLUDGE) salivation, lacrimation, urination, diaphoresis, gastrointestinal upset, emesis and progressing to bronchospasm, bronchorrhea, blurred vision, bradycardia or tachycardia, hypotension, confusion, and shock. Nicotinic effects Skeletal muscle initially exhibits fasciculation (involuntary irregular, violent muscle contractions) followed by the inability to repolarize cell membranes resulting in weakness and paralysis. Severe reactions can lead to ventilatory failure and death (cholinergic crisis).