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 features of Trachoma stage III, except – 
Select and explain. 
A. Herbert's pits, B. Pannus, C. Necrosis in scar, D. Scar on tarsal conjunctiva
B: Pannus
Answer: B: Pannus 
Explanation: Stage III of trachoma is cicatrising or scarring stage. So, Herbert pits (are healed scars of Herbert follicles), scar on tarsal conjunctiva & necrosis in scar are all the features of stage III. Where as herbert follicles (IIa), papillary hyperplasia (IIb), Pannus is found in stage II.