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': 'Very high intraocular pressure, veically oval mid-dilated pupil and shallow anterior chamber is seen in: \nSelect and explain. \nA. Primary open angle glaucoma, B. Acute primary angle closure glaucoma, C. Malignant glaucoma, D. Pupillary block glaucoma', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans. B: Acute primary angle closure glaucoma', 'role': 'assistant'}]