This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Anatomy, Development and clinical examination, Subject name: Ophthalmology
[{'content': 'Normal level of visual acuity is attained at which age \nSelect and explain. \nA. 6 months, B. 1 year, C. 3 years, D. 6 years', 'role': 'user'}, {'content': 'Answer: C \nExplanation: In clinical practice, measurement of the threshold of discrimination of two spatially-separated targets (a function of the fovea centralis) is termed visual acuity Visual acuity recorded by Snellen&;s test cha is a measure of the form sense Reference : A K KHURANA Comorehensive Ophtalmology edition 4,page-16', 'role': 'assistant'}]