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': 'Which among the following drug is contra–indicated in renal failure ? \nSelect and explain. \nA. Pethidine, B. Morphine, C. Fentanyl, D. Atracurium', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]