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
Atropine is useful in organophosphate poisoning because it - 
Select and explain. 
A. Reactivates acetylcholinesterase, B. Competes with acetylcholine release, C. Binds with both nicotinic and muscarinic acetylcholine receptors, D. Is a competitive antagonist of acetylcholine
D: Is a competitive antagonist of acetylcholine
Answer: D: Is a competitive antagonist of acetylcholine 
Explanation: Ans. is 'd' i.e., Is a competitive antagonist of acetylcholine o Atropine acts as competitive antagonist at muscarinic receptors. It has no activity on nicotinic receptors and has nothing to do with Ach release.