4.一位病人主訴呼吸急促,血液檢查顯示Hb 9.6 gm/dL,白血球及血小板數目正常,血液抹片如圖所示。此病人最可能的診斷為?(A)Aplastic anemia(B)Iron deficiency anemia(C)Hemolytic anemia(D)Vit B12 deficiency anemia(E)Thalassemia