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 rings (KF ring) are seen in 
Select and explain. 
A. Pterygium, B. Hematochromatosis, C. Wilson's disease, D. Menke's kinked hair syndrome
C: Wilson's disease
Answer: C: Wilson's disease 
Explanation: C i.e. Wilson's disease