One of the earliest symptoms of Vit. A deficiency is________________?
Correct answer: D. Nyctalopia
- A. Keratomalacia
- B. Xerophthalmia
- C. Bitot's spot
- D. Nyctalopia
Explanation
Nyctalopia, or night blindness, is usually the earliest clinical manifestation of vitamin A deficiency because retinal photopigment formation is impaired first. Xerophthalmia, Bitot’s spots and keratomalacia occur with more advanced deficiency.
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