This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Pathology
[{'content': 'Response of iron therapy in a patient with iron deficiency anemia is denoted by: \nSelect and explain. \nA. Restoration of enzymes, B. Reticulocytosis, C. Increase in iron binding capacity, D. Increase in hemoglobin', 'role': 'user'}, {'content': 'Answer: B \nExplanation: In uncomplicated cases, oral iron supplementation produces an increase in reticulocytosis in about 5-7 days that is followed by a steady increase in blood counts and normalization of red cell indices.', 'role': 'assistant'}]