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 66 year old presents to emergency with sudden onset severe pain, blurring vision in right eye. Examination reveals decreased visual acuity with shallow cornea, hazy cornea in the same eye.Eye has a stony hard consistency.Likely diagnosis is: \nSelect and explain. \nA. Keratitis, B. Uveitis, C. Conjunctivitis, D. Glaucoma', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Glaucoma', 'role': 'assistant'}]