Atropine is useful in organophosphate poisoning  because it:: (A) Reactivates acetylcholinesterase, (B) Competes with acetylcholine release, (C) Binds with both nicotinic and muscarinic acetylcholine receptors, (D) Is a competitive antagonist of acetylcholine
Answer is D. Atropine acts as an antagonist at muscarinic receptors. It has no activity on nicotinic receptors and does not interfere with the release of ACh.