This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Hematology, Subject name: Pediatrics
[{'content': 'The initial response to iron therapy in a child suffering from iron-deficiency anemia is \nSelect and explain. \nA. Reticulocytosis, B. Replacement of intracellular iron enzymes, C. Initial bone marrow response, D. Erythroid hyperplasia', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Response to iron therapy can be documented by an increase in reticulocytes 5-10 days after the initiation of iron therapy. The hemoglobin concentration increases by about 1 g/dL weekly until normal values are restored Replacement of intracellular iron enzymes Ref essential paediatrics op ghai 9e', 'role': 'assistant'}]