This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Muscle relaxants, Subject name: Anaesthesia
[{'content': 'Cis atracurium is preferred over atracurium due to advantage of \nSelect and explain. \nA. Rapid onset, B. Sho duration of action, C. No histamine release, D. Less cardiodepressant', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Cisatracurium is preferred over atracurium as it does not release histamine. Onset of action is same for both atracurium and cisatracurium. Cis-atracurium has longer duration of action.', 'role': 'assistant'}]