A 55-year-old man reports tiredness and exertional dyspnoea. FBC shows Hb 88 g/L, MCV 70 fL and low ferritin. He has no obvious bleeding history but reports a change in bowel habit. What is the most appropriate next step?AStart oral iron and review in 6 monthsBReassure that this is dietary and treat with iron onlyCUrgent two-week-wait referral for suspected colorectal cancerDArrange colonoscopy routinely within 1 yearERefer for bone marrow biopsyCheck my answer