This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Inflammations of Conjunctiva - Allergic and Granulomatous, Subject name: Ophthalmology
Conjunctival xerosis is seen in - 
Select and explain. 
A. Vitamin A deficiency, B. Herpetic keratitis, C. Glaucoma, D. None
A: Vitamin A deficiency
Answer: A: Vitamin A deficiency 
Explanation: Ans. is 'a' i.e., Vitamin A deficiencyo Xerosis of conjunctiva refers to a condition where the conjunctiva becomes dry and lusterless. Depending upon the etiology', conjunctival xerosis can be divided into two groups : -A) Parenchymatous xerosis : - It occurs following cicatricial disorganization of conjunctiva due to local causes which can be : -TrachomaDiphtheric membranous conjunctivitisStevens - Johnson syndromePemphigusThermal, chemical or radiational burnLagophthalmos due to symblepheron.B) Epithelial xerosis : - It occurs due to vitamin 'A'deficiency (Xerophthalmia).