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 is seen in: 
Select and explain. 
A. Vernal keratoconjunctivitis, B. Pterygium, C. Ocular pemphigoid, D. Trachoma
D: Trachoma
Answer: D: Trachoma 
Explanation: D i.e. Trachoma