<prompt> Please answer with one of the option in the bracket. Write reasoning in between . Write answer in between .Q:A 25-year-old African-American woman visits the doctors office complaining of fatigue for a couple of months. She says that she feels exhausted by the end of the day. She works as a dental assistant and is on her feet most of the time. However, she eats well and also tries to walk for 30 minutes every morning. She also says that she sometimes feels breathless and has to gasp for air, especially when she is walking or jogging. Her past medical history is insignificant, except for occasional bouts of cold during the winters. Her physical exam findings are within normal limits except for moderate conjunctival pallor. Complete blood count results and iron profile are as follows:Hemoglobin 9 gdLHematocrit 28.5RBC count 5.85 x 106mm3WBC count 5,500mm3Platelet count 212,000mm3MCV 56.1 flMCH 20.9 pgcellMCHC 25.6 gdLRDW 11.7 Hbcell Serum iron 170 mcgdLTotal iron-binding capacity TIBC 458 mcgdLTransferrin saturation 60A peripheral blood smear is given. When questioned about her family history of anemia, she says that all she remembers is her dad was never allowed to donate blood as he was anemic. Which of the following most likely explains her cell counts and blood smear results?? A: Iron-deficiency anemia, B: Thalassemia, C: B12 deficiency, D: Hemolysis, E: Folate deficiency,  <response>: Based on the information provided in the question stem, the patient is a 25-year-old African-American woman with symptoms of fatigue, breathlessness, and conjunctival pallor. Lab results show low hemoglobin, hematocrit, and MCV along with a peripheral blood smear consistent with microcytic, hypochromic anemia. Her iron studies show adequate iron stores based on normal serum iron, TIBC, and transferrin saturation. The family history of anemia in her father suggests a hereditary cause. Of the answer choices provided, thalassemia is the most likely diagnosis given the microcytic, hypochromic anemia with normal iron studies and a family history concerning for thalassemia trait in her father. Iron deficiency anemia is less likely given the normal iron studies. B12 and folate deficiencies would cause macrocytic rather than microcytic anemia. Hemolysis could cause anemia but would not explain the microcytosis.B: Thalassemia 