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: Anaesthesia
[{'content': 'Which of the following is not an amino steroid derivative \nSelect and explain. \nA. Vecuronium, B. Alcuronium, C. Pancuronium, D. Pipecuronium', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Alcuronium chloride is a neuromuscular blocking agent, alternatively referred to as a skeletal muscle relaxant.\nIt is a semi-synthetic substance prepared from C-toxiferine I, a bis-quaternary alkaloid obtained from Strychnos toxifera.', 'role': 'assistant'}]