This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Pharmacology
[{'content': 'which of the following beta blocker is contraindicated in renal failure ? \nSelect and explain. \nA. betaoxolol, B. celiprolol, C. pindolo, D. labetelol', 'role': 'user'}, {'content': 'Answer: A \nExplanation: betablockers not given in renal failure : betaxolol acebutolol nadolol atenolol nebivolol ref : kd tripathi 8th ed', 'role': 'assistant'}]