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: Anaesthesia
D–tubocurarine acts by – 
Select and explain. 
A. Inhibiting nicotinic receptors at myoneural junction, B. Inhibiting nicotinic receptors at autonomic ganglion, C. Producing depolarizing block, D. By inhibiting reuptake of acetylcholine
A: Inhibiting nicotinic receptors at myoneural junction
Answer: A: Inhibiting nicotinic receptors at myoneural junction 
Explanation: All non-depolarizing blockers (D-tubocurarine) act as competitive antagonist of acetylcholine on nicotinic (Nm) receptors at myoneural junction.