A 62-year-old man with irritable bowel-type symptoms (abdominal pain relieved by defecation, altered stool form for >6 months) has normal blood tests, no weight loss, and no alarm features. What is the most appropriate management?AArrange urgent colonoscopyBDiagnose irritable bowel syndrome using Rome IV criteria and manage conservativelyCStart long-term high-dose opioidsDIgnore symptoms as they are functionalEOrder CT abdomen for all casesCheck my answer