This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Cornea, Subject name: Ophthalmology
[{'content': 'Not true regarding arcus senilis \nSelect and explain. \nA. Deposition of lipids in cornea, B. Seen in corneal periphery, C. There is clear margin between the limbus and the arcus deposition, D. It stas from superior cornea and then involves inferior cornea', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Arcus senilis usually stas from inferior cornea and then involves superior cornea. Arcus senilis Corneal degeneration. Deposition of lipids in cornea. Seen in corneal periphery. There is clear margin between the limbus and the arcus deposition. It stas from inferior cornea and then involves superior cornea. Does not invade visual axis.', 'role': 'assistant'}]