A 60-year-old woman presents with fatigue and pallor. Haemoglobin is 85 g/L, MCV 70 fL, ferritin 5 µg/L, and transferrin saturation is low. She has no obvious bleeding. What is the most appropriate next step in management?AOral iron supplementation and investigation for occult blood loss, including colonoscopyBBlood transfusion only, with no investigationCVitamin B12 injectionsDReassurance; this pattern is normal in older adultsEStart erythropoiesis-stimulating agentCheck my answer