This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Toxicology, Subject name: Forensic Medicine
Organophosphorous compounds act by which of the following? 
Select and explain. 
A. Stimulating Acetyl choline esterase, B. Inhibiting Acetyl choline esterase, C. Blocking Acetyl choline receptors, D. None
B: Inhibiting Acetyl choline esterase
Answer: B: Inhibiting Acetyl choline esterase 
Explanation: Ans. b (Inhibiting Acetyl choline esterase). (Ref. Parikh, Textbook of FMT, 5th/892)ORGANOPHOSPHOROUS COMPOUND POISONING# It produces cholinergic syndrome (muscarinic and nicotinic effects).# Muscarinic effects include:- bradycardia, bronchorrhoea, lacrimation, sweating, hyperperistalsis, wheezing, salivation, incontinence and miosis (pin point pupils).- Hint:* Salivation* Lacrimation* Urinary incontinence* Decreased heart rate* GI symptoms* Excessive sweating and elation# Nicotinic effects include:- initial hypertension,- tachycardia,- fasciculations,- muscle weakness,- agitation and anxiety.# 'Red tears' is also its feature.