Which reference to human nutrition, which one of the following statements is not correct?

a. Deficiency of Vitamin A can cause the non-functioning of tear producing glands
b. Vitamin A is synthesized in the skin in the presence of sunlight
c. Deficiency of Vitamin B1 is common in those areas where polished rice is the major food item
d. Deficiency of Vitamin D causes increased loss of calcium in urine