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: Atropine acts as an antagonist at muscarinic receptors. It has no activity on nicotinic receptors and does not interfere with the release of ACh.