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 - Infective, Subject name: Ophthalmology
[{'content': 'Epithelial xerosis of the conjunctiva is caused by - \nSelect and explain. \nA. Trachoma, B. Diphtheria, C. Xerophthalmia, D. Pemphigus', 'role': 'user'}, {'content': "Answer: C \nExplanation: Ans. is 'c' i.e., Xerophthalmia Xerosis of conjunctiva o 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 : - Parenchymatous xerosis : - It occurs following cicatricial disorganization of conjunctiva due to local causes which can be : - Trachoma Diphtheric membranous conjunctivitis Stevens - Johnson syndrome Pemphigus Thermal, chemical or radiational burn Lagophthalmos due to symblepharon. Epithelial xerosis: It occurs due to vitamin 'A'deficiency (Xerophthalmia).", 'role': 'assistant'}]