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
[{'content': 'Which of the following neuromuscular blocker is most cardiostable- \nSelect and explain. \nA. Vecuronium, B. d-tubocurare, C. Atracurium, D. Pancuronium', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Benzylisoquinoline group causes histamine release so associated with hypotension and tachycardia. Aminosteroid group - no histamine release in aminosteroid group only pancuronium causes vagal blockade - Hypeension and Tachycardia.', 'role': 'assistant'}]