This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Neuromuscular Blocker, Subject name: Anaesthesia
Mode of action of depolarizing and non-depolarizing neuromuscular blocker? 
Select and explain. 
A. Depolarizing - no repolarization, non-depolarizing - competitive inhibition, B. Both competitive inhibitors, C. Non-depolarizing - no repolarization; depolarizing - no depolarizin, D. Depolarizing - persistent depolarization no depolarizing - no repolarization
A: Depolarizing - no repolarization, non-depolarizing - competitive inhibition
Answer: A: Depolarizing - no repolarization, non-depolarizing - competitive inhibition 
Explanation: Depolarizing neuromuscular block-persistent depolarization / no repolarization Non depolarizing - competitive inhibition Succinylcholine is the only depolarising neuromuscular blocker rest all neuromuscular blocker in clinical use are nondepolarising neuromuscular blocker.