Which one of the following metals is most likely deficient when blood hemoglobin level is low?

Question

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Iron is essential for the formation of hemoglobin, the protein in red blood cells that carries oxygen throughout the body. When the body has low levels of iron, it is unable to produce enough hemoglobin, resulting in anemia and a low blood hemoglobin level. Zinc, copper, and manganese are not directly involved in hemoglobin production.

Which One of the Following Metals Is Most Likely Deficient