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
Arlt's line are usually seen in: 
Select and explain. 
A. Ocular pemphigoid, B. Trachoma, C. Vernal keratoconjunctivitis, D. Pterygium
B: Trachoma
Answer: B: Trachoma 
Explanation: Cicatricial trachoma linear scars may be seen in the sulcus subtarsalis, these are called Arlt'slines. Since its caused by Chlamydia trachomatis the antibiotic of choice is azithromycin. Ref: A.K KHURANA (2005), Chapter 4, "Disease of The Conjunctiva", In the book, "Opthalmology", 3rd Edition, Newdelhi, Page 90