Explanation by: Mr. Dubey

Iron is a crucial metal present in hemoglobin, the protein in red blood cells that carries oxygen throughout the body.

Other options:

  • (A) Calcium – Found mostly in bones and teeth.
  • (B) Sodium – Important for nerve function and fluid balance, but not the primary metal in blood.
  • (D) Zinc – Involved in enzyme function, but not a major blood component.

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