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
The earliest clinical manifestation of siderosis bulbi is: 
Select and explain. 
A. Rusty deposits in the anterior subcapsular cells of the lens, B. Discolouration of iris, C. Deposits in Descemet's membrane of cornea, D. Pigmentary changes in retina
A: Rusty deposits in the anterior subcapsular cells of the lens
Answer: A: Rusty deposits in the anterior subcapsular cells of the lens 
Explanation: Ans. Rusty deposits in the anterior subcapsular cells of the lens