Vitamin Deficiencies in Children

In a child with vitamin A deficiency, which ocular finding is considered irreversible and represents the most advanced stage of xerophthalmia?

A 3-year-old child presents with night blindness, Bitot's spots, and corneal haziness. Ophthalmologic examination confirms xerophthalmia stage X1B. What is the drug of choice for immediate treatment?

A 3-year-old child from rural India presents with bowing of legs, frontal bossing, and delayed fontanelle closure. Biochemical investigations show elevated alkaline phosphatase and low 25-hydroxyvitamin D levels. Which single clinical feature best distinguishes vitamin D deficiency rickets from vitamin C deficiency (scurvy)?

A 3-year-old child from rural India presents with night blindness, Bitot's spots, and corneal haziness. Regarding vitamin A deficiency manifestations in children, all of the following are correct EXCEPT:

A 18-month-old boy from rural Maharashtra presents with his mother who reports progressive swelling of his legs and face over the past 3 months. The child has been exclusively fed boiled rice and salt water since weaning at 6 months due to severe poverty. On examination, he is severely wasted (weight-for-age 50% of expected), has pitting edema of both legs, and sparse, thin, depigmented hair. Serum albumin is 1.8 g/dL. His hemoglobin is 7.2 g/dL. What is the most likely diagnosis?