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
[{'content': '78 yr old male came to OPD with chief complaint of diminution of vision in both eyes. IOP in both eyes was 24 mm Hg and there was inferior notch seen in optic nerve head. On visual fields there was a paracentral scotoma. Which of the following is the drug of choice? \nSelect and explain. \nA. Latanoprost, B. Timolol, C. Carbonic anhydrase inhibitor, D. Brimonidine', 'role': 'user'}, {'content': 'Answer: A \nExplanation: the clinical feature depicts the condition towards primary open angle glaucoma Latanoprost (PG analogue) is the drug of choice for primary open angle glaucoma.', 'role': 'assistant'}]