A 34-year-old woman presents with fatigue and bloating. She has iron deficiency anaemia and intermittent diarrhoea. Serology shows positive tissue transglutaminase IgA antibodies. What is the most appropriate next step?AArrange immediate colonoscopy for suspected colorectal cancerBStart a life-long gluten-free diet without further testsCRefer for upper GI endoscopy with duodenal biopsiesDRepeat tissue transglutaminase antibodies in 6 monthsEStart oral mesalazine for suspected inflammatory bowel diseaseCheck my answer