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': "Cause of red congested painful eye with mild dilated veically oval pupil \nSelect and explain. \nA. Acute congestive glaucoma, B. Anterior uveitis, C. Keratoconjunctivitis, D. Eale's disease", 'role': 'user'}, {'content': 'Answer: A \nExplanation: A i.e. Acute congestive glaucoma', 'role': 'assistant'}]