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: Pharmacology
[{'content': 'Cis–atracurium is preferred over atracurium, because : \nSelect and explain. \nA. It has rapid onset of action, B. It causes less release of histamine, C. It has short duration of action, D. It has less depressant action on heart', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]