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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

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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

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28. Chronic consumption of excess selenium can lead to

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

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29. Normal glucose metabolism requires

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

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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

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