26. Which of the following vitamin is essential for the absorption of calcium from the intestinal tract?

A. Vitamin D
B. Vitamin E
C. Vitamin B₁₂
D. Vitamin B₆

27. Which trace mineral is a component of the enzyme that activates vitamin A in the eye?

A. Zinc
B. Iron
C. Iodine
D. Chromium

28. Chronic consumption of excess selenium can lead to

A. brittle hair and nails.
B. muscle weakness,
C. TPN
D. diarrhea.

29. Normal glucose metabolism requires

A. chromium
B. manganese
C. magnesium
D. calcium

30. Manganese is needed for

A. normal bone structure
B. reproduction and functioning of central nervous system
C. both (a) and (b)
D. muscle strengthening