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 power of reduced eye is \nSelect and explain. \nA. 17 D, B. 45 D, C. 59 D, D. 66 D', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Ans. 59 D', 'role': 'assistant'}]