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': "Kayser Fleischer ring occurs at \nSelect and explain. \nA. Epithelium, B. Descemet's membrane, C. Endothelium, D. All of the above", 'role': 'user'}, {'content': "Answer: B \nExplanation: (Descemet's membrane) (410-Khurana 4th)Kayer- Fleischer ring - is a golden- brown ring which occurs due to deposition of copper (Chalcosis) under peripheral parts of the Descement's membrane of the cornea* K. F. ring seen in a patients of with liver cirrhosis or ataxia can confirm the presence of wilson's disease (507- Parson 20th edition)", 'role': 'assistant'}]