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: None', 'role': 'assistant'}]