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 associated with the inborn error of metabolism of which of the following? 
Select and explain. 
A. Iron, B. Nickel, C. Copper, D. Zinc
C: Copper
Answer: C: Copper 
Explanation: Sunflower cataract is associated with the inborn error of copper metabolism (Wilson's disease). Ref: A K Khurana, 5th Edition, Page 91