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
[{'content': 'what is deposited in Kyser-Fleischer ring- \nSelect and explain. \nA. Copper, B. Lead, C. Mercury, D. Heme', 'role': 'user'}, {'content': "Answer: A \nExplanation: *Kauser-Fleischer (KF) ring-> Copper deposition in Chalcosis or Wilson's disease *Fleischer ring-> Deposition of iron and is a sign of keratoconus", 'role': 'assistant'}]