This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Ocular trauma , Subject name: Ophthalmology
Kayser fleischer ring is seen in - 
Select and explain. 
A. Siderosis, B. Chalcosis, C. Open angle glaucoma, D. Chemical injuries
B: Chalcosis
Answer: B: Chalcosis 
Explanation: Chalcosis- It refers to the specific changes produced by the alloy of copper in the eye. Mechanism - copper ions from the alloy are dissociated electrolytically and deposited under the membranous structures of the eye. KF ring is due to deposition of copper under peripheral pas of descemets membrane of cornea. Fleischer ring - seen in keratoconus (epithelial iron deposits - base of the cone) Ref: Parson's 22nd edition, page no.396