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': 'K-F ring is pathognomonic of \nSelect and explain. \nA. Cholestatic jaundice, B. PBC, C. Hemochromatosis, D. Decreased ceruloplasmin level', 'role': 'user'}, {'content': "Answer: D \nExplanation: Ans. d (Decreased ceruloplasmin level). (Ref. Parson, Diseases of Eye, 19th ed.568)Keyser-Fleischer (KF) ring is a diagnostic feature of Wilson's Disease or hepatolenticular degeneration.TYPE OF PIGMENTDISORDERLOCATIONIronKeratoconus (Fleischer ring)Corneal epithelium Old opacity (Hudson-Stahhline)Corneal epithelium Pterygium (Stocker's line)Corneal epithelium Filtering bleb (Ferry's line)Corneal stromaCopperWilson's disease, Chalcosis (KF ring)Descemets membraneMelaninPigment dispersion syndrome (Krukenberg's spindle)Descemets membrane", 'role': 'assistant'}]