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 rings (KF ring) are seen in \nSelect and explain. \nA. Pterygium, B. Hematochromatosis, C. Wilson's disease, D. Menke's kinked hair syndrome", 'role': 'user'}, {'content': "Answer: C \nExplanation: C i.e. Wilson's disease", 'role': 'assistant'}]