1. A 66-year-old wom an was adm itted to the hospital because of tiredness, breathlessness, and fatigue over the past 3 weeks. Two years ago, she underwent gastrectomy for severe nonhealing ulcers....

1. A 66-year-old wom an was adm itted to the hospital because of tiredness, breathlessness, and fatigue over the past 3 weeks. Two years ago, she underwent gastrectomy for severe nonhealing ulcers. The only m edication the patient was taking was cyanocobalam in, intram uscularly, once a m onth. Pertinent laboratory values on adm ission were red blood cell count 2.8 × 106/mm 3 (norm al, fem ale 3.5-5.5 × 106/m m 3), m ean corpuscular volum e 60 fL (norm al 80-100 fL), hem oglobin 8.6 g/dL (norm al, fem ale > 12 g/dL), hem atocrit 32% (norm al 36-46%). Which of the follow ing drugs given orally would m ost likely im prove the patient’s condition? A. Vitam in B12 B. Folic acid C. Iron dextran D. Sargram ostim E. Erythropoietin F. Ferrous sulfate