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
All are seen in stage III trachoma except – 
Select and explain. 
A. Tarsal epitheliofibrosis, B. Trachomatous pannus, C. Herbert's pits, D. Disappearance of Bowman's membrane
B: Trachomatous pannus
Answer: B: Trachomatous pannus 
Explanation: McCallan's classification-McCallan in 1908 divided the clinical course of trachoma into 4 stages