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: Ophthalmology
Argon laser trabeculoplasty is used in: 
Select and explain. 
A. Closed-angle glaucoma, B. Primary open-angle glaucoma, C. Neovascular glaucoma, D. Aphakic glaucoma
B: Primary open-angle glaucoma
Answer: B: Primary open-angle glaucoma 
Explanation: Ans. Primary open-angle glaucoma