This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Ophthalmology
[{'content': 'In a child the normal resolution visual acuity levels such as that of adults i.e. 6/6 is attained by which age? \nSelect and explain. \nA. 4 months, B. 1 year, C. 3 years, D. 6 years', 'role': 'user'}, {'content': 'Answer: D \nExplanation: .', 'role': 'assistant'}]