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
[{'content': 'KF ring is seen in - \nSelect and explain. \nA. Chalcosis, B. Diabetes mellitus, C. Keratoconus, D. Anterior Uveitis', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' i.e., Chalcosis Chalcosiso Chalcosis is perforating injury to eye with metal containing copper (Cu). o Copper deposition can lead toi) Grayish-green/golden brown discoloration of peripheral cornea called Kayser-Fleisher ring.ii) Sunflower (Petal of flower) cataract due to deposition of copper under the posterior capsule of the lens.iii) Golden plaque at posterior pole of the retina.", 'role': 'assistant'}]