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': "KISA% is associated with \nSelect and explain. \nA. Keratoconus, B. Keratoglobus, C. Hypermetropia with astigmatism, D. Terrien's marginal degeneration", 'role': 'user'}, {'content': 'Answer: A \nExplanation: Answer- A. KeratoconusThe KISA index is used in cases ofkeratoconus and is derived using 4 indices:Central keratometry KInferior- Superior keratometry (I-S)Astigmatism Index (AST)', 'role': 'assistant'}]