This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Ocular trauma , Subject name: Ophthalmology
[{'content': 'Copper deposition in cornea leads to - \nSelect and explain. \nA. Keratoconus, B. Keratoglobus, C. KF ring, D. Siderosis', 'role': 'user'}, {'content': "Answer: C \nExplanation: Kayser- Fleischer ring. It is a golden brown ring which occurs due to deposition of copper under peripheral pas of the descemet's membrane of the cornea. Ref: Parson's 22 nd edition , page no.396", 'role': 'assistant'}]