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
Earliest clinical manifestation of siderosis bulbi 
Select and explain. 
A. Iris is stained greenish, B. Retinal pigmentary degeneration, C. Glaucoma, D. Rusty deposits in the anterior subcapsular cells of the lens
D: Rusty deposits in the anterior subcapsular cells of the lens
Answer: D: Rusty deposits in the anterior subcapsular cells of the lens 
Explanation: These rusty deposits are arrested radially in a ring ---- Earliest manifestation.