A 45-year-old man presents with fatigue and exertional dyspnoea. Laboratory investigations show Hb 90 g/L, MCV 72 fL, ferritin 6 µg/L and low transferrin saturation. He has no overt bleeding. What is the most appropriate next step in management?AReassure him and repeat blood tests in 1 yearBStart oral iron supplementation and arrange evaluation of the gastrointestinal tractCTransfuse 2 units of red blood cells immediately and dischargeDBegin erythropoiesis-stimulating agent therapyETreat with folic acid and vitamin B12 without further investigationCheck my answer