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
Cardioselective β - blocker used in glaucoma is 
Select and explain. 
A. Timolol, B. Betaxolol, C. Acebutalol, D. Carvedilol
B: Betaxolol
Answer: B: Betaxolol 
Explanation: Both Timolol & Betaxolol are used against glaucoma, but Betaxol is caridoselective (selective β1 blocker).