This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Aplastic Anemia, Subject name: Pathology
[{'content': 'A 30-year-old woman complains of recent easy fatigability, bruising, and recurrent throat infections. Physical examination reveals numerous petechiae over her body and mouth. Abnormal laboratory findings include hemoglobin of 6 g/dL, WBC of 1,500/mL, and platelets of 20,000/mL. The bone marrow is hypocellular and displays increased fat. What is the appropriate diagnosis? \nSelect and explain. \nA. Aplastic anemia, B. Iron-deficiency anemia, C. Megaloblastic anemia, D. Leukemia', 'role': 'user'}, {'content': 'Answer: A \nExplanation: - Given features suggests the diagnosis of Aplastic anemia - Aplastic anemia is a disorder of pluripotent stem cells causing bone marrow failure resulting in hypocellular bone marrow & pancytopenia - Most cases are idiopathic. - Iron-deficiency anemia (choice B) and megaloblastic anemia (choice C) are not characterized by a hypoplastic bone marrow.', 'role': 'assistant'}]