1st clinical sign of vitamin A deficiency is_____________?
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Answer: D. conjunctival xeroses
Explanation
Vitamin A deficiency impairs the normal functioning of conjunctival membranes. Conjunctival xerosis causes dryness and loss of normal moist luster. This dryness represents the earliest clinical sign of vitamin A deficiency. Vitamin A is crucial for maintaining healthy epithelial tissues and vision. Nutritional deficiencies lead to progressive ocular complications over time. Early detection prevents irreversible damage to the cornea and vision.
Public health programs monitor childhood vitamin A deficiency in developing nations. Clinical ophthalmologists identify xerosis during routine nutritional examinations. Dietary supplementation successfully reverses early symptoms of vitamin A deficiency. Option A night blindness is a later clinical symptom of vitamin A deficiency. Option B Bitot spots develop after prolonged untreated deficiency conditions. Option C xerostomia refers to dry mouth rather than conjunctival dryness.
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