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 in: \nSelect and explain. \nA. Pinguencula, B. Pterygium, C. Congenital Ocular Melanosis, D. Congenital epithelial melanosis", 'role': 'user'}, {'content': 'Answer: B \nExplanation: B i.e. Pterygium', 'role': 'assistant'}]