<prompt> Please answer with one of the option in the bracket. Write reasoning in between . Write answer in between .Q:A 7-year-old child with a history of abdominal and thigh pain that runs in his family is brought into the emergency room by his mother. His mother states they have a blood disease. She also states the child was coughing and had fever to 101.1 F over the last three days and has been suddenly feeling much worse. On exam, the vitals are HR 110, BP 10060, RR 20, T 101.5 F. CBC is significant for Hgb 3.2, WBC 2.1, Hct 10, Plts 30000. The reticulocyte count is 1 and the MCV is 81. Bone marrow biopsy shows hypocellular marrow with fatty tissue. What is the most likely diagnosis?? A: Aplastic anemia, B: Anemia of chronic disease, C: Iron deficiency anemia, D: Folate deficiency anemia, E: Hypersplenism associated anemia,  <response>: Based on the information provided in the question stem, this appears to be a case of a child with a family history of some sort of blood disorder presenting with symptoms of fever, cough, and worsening abdominal and thigh pain. Lab results show a low hemoglobin, hematocrit, white blood cell count, and platelet count. The reticulocyte count is low and the MCV is normal. The bone marrow biopsy shows hypocellular marrow with increased fatty tissue. This constellation of findings - pancytopenia, hypocellular marrow, and low reticulocyte count - points towards a diagnosis of aplastic anemia over other causes of anemia. The normal MCV makes iron, folate and B12 deficiency anemias less likely. The lack of splenomegaly makes hypersplenism less likely as well. A: Aplastic anemia 