This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Primary Angle-Closure Glaucoma, Subject name: Ophthalmology
[{'content': 'Which muscarinic agonist is used in the treatment of angle closure glaucoma? \nSelect and explain. \nA. Pilocarpine, B. Neostigmine, C. Brimonidine, D. Dipiveffine', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' i.e., Pilocarpine Angle closure glaucomao Treatment of choice for acute congestive glaucoma - Laser iridotomy (1st choice), Peripheral iridectency (2nd choice)o Drug of choice for acute congestive glaucoma - Pilocarpineo Initially IOP is controlled (first drug used) - Systemic mannitol or acetazolamideOpen angle glaucomao Treatment of choiceo Drug of choiceo Surgery of choiceTopical antiglaucoma drugsb - blocker (Timolol, betaxolol, levobunalol)Argon or diode laser trabeculoplasty", 'role': 'assistant'}]