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
Very high intraocular pressure, veically oval mid-dilated pupil and shallow anterior chamber is seen in: 
Select and explain. 
A. Primary open angle glaucoma, B. Acute primary angle closure glaucoma, C. Malignant glaucoma, D. Pupillary block glaucoma
B: Acute primary angle closure glaucoma
Answer: B: Acute primary angle closure glaucoma 
Explanation: Ans. B: Acute primary angle closure glaucoma