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
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: Ans. is 'a' i.e., Inhibiting nicotinic receptors at myoneural junction o D-tubocurarine is a skeletal muscle relaxant that acts by competitive inhibition of NM receptors at neuron-muscular junction.