This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Ocular Manifestations, Subject name: Ophthalmology
Kayser flescher ring is seen in - 
Select and explain. 
A. Siderosis, B. Chalcosis, C. Open angle glaucoma, D. Chemical injuries
B: Chalcosis
Answer: B: Chalcosis 
Explanation: Ans. is 'b' i.e.. Chalcosis Chalcosiso It refers to the specific changes produced by the alloy of copper in the eye.o Mechanism. Copper ions from the alloy are dissociated electrolvtically and deposited under the membranous structures of the eye. Unlike iron ions these do not enter into a chemical combination with the proteins of the cells and thus produce no degenerative changes.o Clinical manifestationsKayser-Fleischer ring: It is a golden brown ring which occurs due to deposition of copper under peripheral parts of the Descemet's membrane of the cornea.Sunflower cataract : It is produced by deposition of copper under the posterior capsule of the lens. It is brilliant golden green in colour and arranged like the petals of a sun flower.Retina : It may show deposition of golden plaques at the posterior pole which reflect the tight with a metallic sheen.