This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Conjunctiva, Subject name: Ophthalmology
Cause of blindness in trachoma- 
Select and explain. 
A. Scarring, B. Pannus, C. Chronic dacrocystitis, D. Entropion
A: Scarring
Answer: A: Scarring 
Explanation: Trachoma is a leading cause of preventable blindness worldwide, Conjunctival scarring which may be irregular, star-shaped or linear. Linear scar present in the sulcus subtarsalis is called Arlt&;s line. ref : A K KHURANA text of Ophtalmology,E4, page-64