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': 'Earliest response to iron in iron deficiency anemia is denoted by \nSelect and explain. \nA. Restoration of enzymes, B. Reticulocytosis, C. Increase in iron birding capacity, D. Increase in heamoglobin', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Response to iron therapy:\n\nRapid subjective improvement, with disappearance (or) marked dimination of fatigue, lassitude, and other nonspecific symptoms before any improvement in anemia is observed.\nEarliest heamotologic evidence of response to treatement is an increase in reticulocytes % G and Hb content.\nMaximal reticulocytes % is on 5th to 10th day after institution of therapy and thereafter returns to normal.\nMaximum value usually ranges from 5 to 10 % and is inversly related to the level of heamoglobin.\nHeamoglobin level is the most accurate measure of the degree of anemia in iron deficiency.', 'role': 'assistant'}]