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
Epithelial xerosis of conjunctiva is caused by - 
Select and explain. 
A. Trachoma, B. Diphtheria, C. Xerophthalmia, D. Pemphigus
C: Xerophthalmia
Answer: C: Xerophthalmia 
Explanation: Epithelial xerosis: It occurs due to hypovitaminosis -A. Epithelial xerosis may be seen in association with night blindness or as a pa and parcel of the xerophthalmia (the term which is applied to all ocular manifestations of vitamin A deficiency which range from night blindness to keratomalacia ref : A K KHURANA OPHTALMOLOGY,E4, page-84 ref img