This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Blood, Subject name: Medicine
[{'content': 'A 42-year-old man is feeling chronically fatigued. His hemoglobin is 11.5 g/dL, and the blood film is hypochromic and microcytic. The serum iron is increased, total iron-binding capacity (TIBC) is normal, ferritin is increased, and HbA2 is decreased.For the above patient with a hypochromic microcytic anemia, select the most likely diagnosis. \nSelect and explain. \nA. iron deficiency anemia, B. beta-thalassemia trait, C. anemia of chronic disease, D. sideroblastic anemia', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Sideroblastic anemia is associated with an increased serum iron and ferritin. TIBC is generally normal. HbA2 is usually decreased.', 'role': 'assistant'}]