<prompt> Atropine is useful in organophosphate poisoning because it -Reactivates acetylcholinesteraseCompetes with acetylcholine releaseBinds with both nicotinic and muscarinic acetylcholine receptorsIs a competitive antagonist of acetylcholine  <response>: 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. 