This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Haematology, Subject name: Pathology
[{'content': 'A low mean corpuscular volume with a normal and cell distribution width suggests - \nSelect and explain. \nA. Iron deficiency anemia, B. B thalassemia trait, C. Anemia of chronic disease, D. Sideroblastic anemia', 'role': 'user'}, {'content': 'Answer: B \nExplanation: In thalassemia MCV is decreased to 45-70fL &RBC count found to be increased or normal. The RBCs are microcytic and normochromic. Ref: Exam preparatory manual for UGs by Ramdas Nayak Page no:270 Ref Robbins 9/e pg 412', 'role': 'assistant'}]