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': 'XIB of xerophthalmia in WHO classification refers to \nSelect and explain. \nA. Corneal sclerosis, B. Conjunctival sclerosis, C. Bitot spots, D. Corneal Ulceration', 'role': 'user'}, {'content': 'Answer: C \nExplanation: X1A - Conjunctival Xerosis\nX1B - Bitot Spots\nX2 - Corneal Xerosis.', 'role': 'assistant'}]