This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Anesthesia, Subject name: Pharmacology
[{'content': 'Laudanosine is a metabolite of \nSelect and explain. \nA. Atracurium, B. Cis Atracurium, C. Pancuronium, D. Vecuronium', 'role': 'user'}, {'content': "Answer: A \nExplanation: Refer Miller 7/e p 880 Both Atracurium and cis-Atracurium are eliminated by Hoffman's elimination Atracurium is also metabolized by liver to some extent and result in production of a metabolite laudanosine that can cause CNS toxicity including seizures", 'role': 'assistant'}]