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': 'Conjunctival Xerosis is seen in: \nSelect and explain. \nA. Vitamin-A deficiency, B. Trachoma, C. Pemphigus, D. All of the above', 'role': 'user'}, {'content': 'Answer: D \nExplanation: All of the above', 'role': 'assistant'}]