This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Symptomatic Conditions, Subject name: Ophthalmology
[{'content': "In case of xeropthalmia secondary to Vitamin A deficiency, what does X2 indicate according to WHO: \nSelect and explain. \nA. Conjunctival xerosis, B. Bitot's spot, C. Corneal xerosis, D. Corneal ulcer", 'role': 'user'}, {'content': "Answer: C \nExplanation: Ans.(c) Corneal xerosisRef: A.K. Khurana 6th ed. /468* Xeropthalmia: all the ocular manifestation of Vitamin A deficiency.* First clinical sign of Vitamin A deficiency: Conjunctival Xerosis* First clinical symptom of vitamin A deficiency: Night blindnessWHO Classification of XeropthalmiaCLASSSIGNSX1AConjunctival xerosisX1BConjunctival xerosis with bitot's spotX2Corneal xerosisX3ACorneal xerosis with ulcerationX3BKeratomalacia", 'role': 'assistant'}]