Explanation
- A
Iron
(a) Iron. Human milk is low in iron; the term infant lives on fetal iron stores for months. That lack is the official key. (a) Official key.
- B
Calcium
(b) Calcium. Breast milk supplies calcium for bone growth; it is not the classic “missing” item.
- C
Magnesium
(c) Magnesium. Present in nutritionally useful amounts in human milk.
- D
Potassium
(d) Potassium. Human milk contains potassium; it is not the keyed deficiency.
Summary. Official key is (a). Mother’s milk is nearly complete but poor in iron. Calcium, magnesium and potassium are not the standard lack named in this item.
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