A positive response to iron therapy is evidenced by an increase in:
1. Reticulocytes.
2. Basophils.
3. Eosinophils.
4. Platelets.
Reticulocytes.
Rationale: Reticulocytes are red blood cells that respond positively to iron therapy, resulting in increased reticulocytes. Basophils and eosinophils are types of white blood cells whose growth is not influenced by iron therapy. Platelets cells are necessary for clotting but are not responsive to iron therapy.
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