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': 'The term anisometropia indicates \nSelect and explain. \nA. Refractive error, B. Long vision, C. Sho vision, D. Ageing process', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans. Refractive error', 'role': 'assistant'}]