This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Cornea, Subject name: Ophthalmology
What is deposited in Kyser-FIeischer ring - 
Select and explain. 
A. Copper, B. Lead, C. Mercury, D. Heme
A: Copper
Answer: A: Copper 
Explanation: Ans. is 'a' i.e., CopperKayser-FLeischer (KF) ring - Copper deposition in Chalcosis or Wilson's diseaseFleischer ring - Deposition of iron and is a sign of keratoconus