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': 'Cardioselective β - blocker used in glaucoma is \nSelect and explain. \nA. Timolol, B. Betaxolol, C. Acebutalol, D. Carvedilol', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Both Timolol & Betaxolol are used against glaucoma, but Betaxol is caridoselective (selective\xa0β1 blocker).', 'role': 'assistant'}]