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': "A 30 year old woman with sudden right-sided painful red eye associated with nausea, vomiting and headache. The diagnosis is: \nSelect and explain. \nA. Acute congestive glaucoma, B. Endophthlmitis, C. Eale's disease, D. Trachoma", 'role': 'user'}, {'content': 'Answer: A \nExplanation: A i.e. Acute congestive glaucoma', 'role': 'assistant'}]