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 child from rural India presents with bleeding gums, petechial rash, and poor wound healing. Serum vitamin C level is low. What is the drug of choice for treatment?