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': 'Severe pain in eye with loss of vision can be a manifestation of: March 2013 (h) \nSelect and explain. \nA. Acute angle closure glaucoma, B. Open angle glaucoma, C. Vitreous hemorrhage, D. Retinal detachment', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans. A i.e. Acute angle closure glaucoma', 'role': 'assistant'}]