A. iron and potassium
B. iron and magnesium
C. magnesium and calcium
D. magnesium and potassium
Correct Answer: Option B
B. iron and magnesium
A. iron and potassium
B. iron and magnesium
C. magnesium and calcium
D. magnesium and potassium
Correct Answer: Option B
B. iron and magnesium
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