A 62-year-old woman presents with progressive fatigue and dyspnoea. Hb is 88 g/L, MCV 72 fL, ferritin 6 µg/L, transferrin saturation 8%. She has no menorrhagia and reports occasional dark stools. What is the most appropriate next step?AStart oral iron therapy and arrange urgent evaluation for gastrointestinal blood lossBReassure her and repeat blood work in 6 monthsCOrder vitamin B12 injectionsDStart erythropoiesis-stimulating agent therapyEDiagnose anaemia of chronic disease and observeCheck my answer