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
Kayser-Fleischer ring is pathognomonic of: 
Select and explain. 
A. Keratoconus, B. Wilson's disease, C. Lowe's syndrome, D. All of the above
B: Wilson's disease
Answer: B: Wilson's disease 
Explanation: Ans. Wilson's disease