1. Vitamin B
  2. Vitamin A
  3. Vitamin C
  4. Vitamin D
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Option 2 : Vitamin A

Vitamin A deficiency is a lack of vitamin A in blood and tissues. Nyctalopia (night blindness) is one of the first signs of VAD. Xerophthalmia, keratomalacia, and complete blindness can also occur since vitamin A has a major role in photo transduction.
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