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
A 30 years old female, RBC Counts 4.5 million, MCV 55 fl, Tc 8000, no history of blood transfusion? 
Select and explain. 
A. Iron deficiency, B. Thalassemia major, C. Thalassemia minor, D. Megaloblastic anemia
C: Thalassemia minor
Answer: C: Thalassemia minor 
Explanation: RBC count within normal limits 4.5(4.2-5.4 millions for female). Therefore rule out anemia MCV 55 => microcytic (80-96 fL ). Could be thalassemia minor or major Since it is a female aged 30 more probablity for thalassemia minor Ref : Robbins 9/e pg 414