What is caused by the deficiency of Vitamin A?
Night blindness
Vitamin A (retinol) is needed to form rhodopsin (visual purple), the pigment of the rod cells of the retina that allows vision in dim light.
Its deficiency causes night blindness (inability to see in dim light), and severe deficiency leads to xerophthalmia.
Rickets is caused by lack of vitamin D, anaemia by lack of iron (or B12/folic acid) and goitre by lack of iodine.
Hence, Night blindness.
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