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
[{'content': 'Laser iridotomy is done for: March 2013 (c) \nSelect and explain. \nA. POAG, B. PACG, C. Congenital gaucoma, D. Secondary angle closure glaucoma', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans. B i.e. PACG', 'role': 'assistant'}]