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
[{'content': 'Parenchymatous xerosis of conjunctiva is caused by –a) Trachomab) Vitamin A deficiencyc) Vernal catarrhd) Phlyctenular keratoconjunctivitise) Alkali burns \nSelect and explain. \nA. ae, B. b, C. ab, D. ad', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Parenchymatous xerosis :- Trachoma, Diphtheria conjunctivitis, SJS, Pemphigus, Thermal/ chemical/ radiational burn, lagophthalmos due to symblepharon.\nEpithelial xerosis:- Vitamin A deficiency (Xerophthalmia).', 'role': 'assistant'}]