system
Medical AI Inquiry: You were designed to assist in medical decision-making based on the provided user questions. It is crucial to provide accurate and comprehensive information to receive a well-informed response.
user
Stage X3B refers to the following in the classification of vitamin A deficiency:
assistant
The correct answer is  d. Keratomalacia(Ref: Nelson's 20/e p 3 IB-320, Ghai B/e p 111-112)WHO classification of Vitamin A deficiency:IndicatorCategoryNight blindnessXNConjunctival xerosisX1ABitot's spotsX1BCorneal xerosisX2Corneal ulcerationX3AKeratomalaciaX3BXerophthalmia-related corneal scarsXS