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': 'Unequal eye power is known as – \nSelect and explain. \nA. Anisometropia, B. Emmetropia, C. Ametropia, D. Astigmatism', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]