This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: C.N.S., Subject name: Medicine
Following eye lesion are seen in which condition: 
Select and explain. 
A. Vitamin B12 deficiency, B. Multiple sclerosis, C. Wilson disease, D. NF1
C: Wilson disease
Answer: C: Wilson disease 
Explanation: Ans. C. Wilson diseaseThe image is showing darkening encircling iris of the eye. These occur due to copper deposition in corneal Descemet's membrane. These rings are a sign of Wilson's Disease. Other causes may be cholestasis primary biliary cirrhosis & cryptogenic cirrhosis.