This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Ecstatic Conditions of Cornea, Subject name: Ophthalmology
[{'content': "Vogt's striae shown below are seen in: \nSelect and explain. \nA. Congenital glaucoma, B. Keratoconus, C. Aphakia, D. Subluxated lens", 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans. (b) Keratoconus.', 'role': 'assistant'}]