This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: A.N.S., Subject name: Pharmacology
[{'content': 'Vecuronium acts on : \nSelect and explain. \nA. Cerebral cortex, B. Myoneural junction, C. Muscle fibres, D. Spinal cord', 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. is 'b' i.e. Myoneural junction Vecuronium is a non depolarizing neuromuscular blocking agent.It acts on nicotinic receptor at neuromuscular junctions and blocks the depolarization by inhibiting Na+ channels.", 'role': 'assistant'}]