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
All of the following drugs are non-depolarizing neuromuscular blocking agents except 
Select and explain. 
A. D-tubocurarine, B. Gallamine triethiodide, C. Pancuronium bromide, D. Succinylcholine
D: Succinylcholine
Answer: D: Succinylcholine 
Explanation: None