This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Ophthalmology
[{'content': 'Sunflower cataract is due to: \nSelect and explain. \nA. Diabetes mellitus, B. Injuries, C. Chalcosis, D. Infections', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Chalcosis', 'role': 'assistant'}]