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 pathognomonic of: \nSelect and explain. \nA. Keratoconus, B. Wilson's disease, C. Lowe's syndrome, D. All of the above", 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. Wilson's disease", 'role': 'assistant'}]