Xeropthalmia, a condition of dryness of the eye caused by damage to the eye tissue, is a sign of vitamin A deficiency disorder (VADD). An earlier sign of VADD is
A. hair loss.
B. night blindness.
C. anemia.
Question 2
The form of vitamin A important for vision is
A. retinol.
B. retinal.
C. retinoic acid.
D. beta-carotene.