This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Conjunctiva, Subject name: Ophthalmology
Iron depostion line at edge of pterygium on corneal epithelium is known as? 
Select and explain. 
A. Stocker's line, B. KF Ring, C. Fleischer ring, D. Ferrys line
A: Stocker's line
Answer: A: Stocker's line 
Explanation: Along the advancing edge of the pterygium is a yellow-brownidh line (Stocker&;s line) caused by hemosiderin (iron containing) in the epithelial layers. Reference : Parson 22nd edition page :184,185