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': "Kayser Fleischer ring is found in which layer of cornea ? \nSelect and explain. \nA. Bowman's membrane, B. Substantia propria, C. Descemet's membrane, D. Endothelium", 'role': 'user'}, {'content': "Answer: C \nExplanation: Ans. Descemet's membrane", 'role': 'assistant'}]