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': 'Beta–adrenoceptor blocking agent that should be avoided in patients with renal failure is: \nSelect and explain. \nA. Atenolol, B. Metoprolol, C. Propranolol, D. Esmolol', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]