This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Glaucoma, Subject name: Ophthalmology
Argon Laser trabeculoplasty is used in - 
Select and explain. 
A. Open angle glaucoma, B. Angle closure glaucoma, C. Buphthalmos, D. None
A: Open angle glaucoma
Answer: A: Open angle glaucoma 
Explanation: Ans. is 'a' i.e., Open angle glaucomaOpen angle glaucoma* Treatment of choice- topical antiglaucoma drugs* Drug of choice - Beta blocker (timolol)* Surgery of choice - Argon or Diode laser trabeculoplasty