This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Lens, Subject name: Ophthalmology
[{'content': 'Chalcosis is assosciated with \nSelect and explain. \nA. Copper, B. Zinc, C. Lead, D. Gold', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Chalcosis is copper deposition whereas gold deposition is called Chrisiasis Long term intake of gold of more than 1000mg leads to corneal deposits and anterior subscapular cataract Refer: Khurana 6th edition page number 434', 'role': 'assistant'}]