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': 'True about fovea centralis: \nSelect and explain. \nA. Cones present, B. Visual acquity lowest, C. Optic nerve passes, D. Rods present', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans. Cones present', 'role': 'assistant'}]