A 34-year-old woman presents with iron-deficiency anaemia and intermittent diarrhoea, bloating and weight loss. Blood tests show raised tissue transglutaminase IgA antibodies. What is the most appropriate next step to confirm the diagnosis?AStart a strict gluten-free diet immediately and review in 6 monthsBSmall bowel barium follow-throughCDuodenal biopsy while continuing a gluten-containing dietDHLA typing for DQ2 and DQ8EColonoscopy with random colonic biopsiesCheck my answer