A 35-year-old premenopausal woman presents with fatigue and pica. Hb is 88 g/L, MCV 72 fL, ferritin 6 µg/L. She has regular but heavy menses and no gastrointestinal symptoms. What is the most appropriate next step?AStart oral iron supplementation and attribute anaemia solely to mensesBArrange colonoscopy onlyCOrder celiac serology and consider GI evaluation if indicatedDTransfuse red cells immediately to Hb >130 g/LEStart IV iron without further evaluationCheck my answer