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': "Munson's sign is seen in: \nSelect and explain. \nA. Keratoconus, B. Keratoglobus, C. Microcornea, D. All", 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans. Keratoconus', 'role': 'assistant'}]