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': 'Kusum lata presents with acute painful red eye and mild dilated vertically oval pupil. Most likely diagnosis is – \nSelect and explain. \nA. Acute retrobulbar neuritis, B. Acute angle closure glaucoma, C. Acute anterior uveitis, D. Severe kerato–conjunctivitis', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Mild dilated (semidilated), vertically oval pupil is characteristic of acute congestive glaucoma.', 'role': 'assistant'}]