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': 'At the end of a balanced anaesthesia technique with non-depolarizing muscle relaxant, a patient recovered spontaneously from the effect of muscle relaxant without any reversal. Which is the most probable relaxant the patient had received. \nSelect and explain. \nA. Pancuronium, B. Gallamine, C. Atracurium, D. Vecuronium', 'role': 'user'}, {'content': 'Answer: C \nExplanation: C i.e. Atracurium', 'role': 'assistant'}]