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': "All are features of Trachoma stage Ill, except: \nSelect and explain. \nA. Herbe's pits, B. Pannus, C. Necrosis in scar, D. Scar on tarsal conjunctiva", 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans. Pannus', 'role': 'assistant'}]