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
Sunflower cataract is due to: 
Select and explain. 
A. Diabetes mellitus, B. Injuries, C. Chalcosis, D. Infections
C: Chalcosis
Answer: C: Chalcosis 
Explanation: Chalcosis