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': 'A 13 year girl with fatigue and weakness was found to be having reduced hemoglobin. Her MCV 70FC, MCH22pg and RDW 28. What is her likely diagnosis \nSelect and explain. \nA. Iron deficiency anemia, B. Thalassemia major, C. Sideroblastic anemia, D. Thalassemia minor', 'role': 'user'}, {'content': "Answer: A \nExplanation: Decreased heamoglobin with the clinical features of fatigue and weakness is diagnostic of anemia.\nMCV is 70% Ft, So, microcytosis is present (normal MCV is 80-96ft)\nMCH is 22pg, so, decreased MCH is suggestive of hypochromic anermia (normal MCH is 27 - 33 pg)\nRed Cell distribution with (RDW) is the co efficient of variation of size of RBC's normal value is 11.5 - 14.5 it is an indicator of anisocytosis which may present in IDA as well as heamolytic anemia.\nIn early iron deficiency anemia, RDW increased along with low MCV white in beta thalassemia trait RDW is normal with low MCV, thus distingguishing from each other.", 'role': 'assistant'}]