<prompt> In case of xeropthalmia secondary to Vitamin A deficiency, what does X2 indicate according to WHO:Conjunctival xerosisBitots spotCorneal xerosisCorneal ulcer  <response>: 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 bitots spotX2Corneal xerosisX3ACorneal xerosis with ulcerationX3BKeratomalacia 