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Which element is deficient in milk _________?

AIron
BPhosphorus
CSodium
DCalcium

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Answer and explanation

Correct Answer: A: Iron

Explanation: The correct answer is A: Iron. Milk is deficient in iron, which is why infants exclusively fed cow's milk may develop iron deficiency anemia. Milk is rich in calcium and phosphorus but contains very little iron, requiring iron supplementation for growing babies.