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
[{'content': "Stocker's line is seen a  – \nSelect and explain. \nA. Pinguecula, B. Pterygium, C. Congenital Ocular Melanosis, D. Conjunctival epithelial melanosis", 'role': 'user'}, {'content': "Answer: B \nExplanation: Stocker's line is a line of iron deposition in the corneal epithelium seen adjacent to the head of the pterygium.", 'role': 'assistant'}]