This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Surgery
[{'content': 'Colonic diverticulosis is best diagnosed by \nSelect and explain. \nA. Colonoscopy, B. Nuclear scan, C. Barium enema, D. CT scan', 'role': 'user'}, {'content': 'Answer: C \nExplanation: "Diverticula are best seen on barium enema. Colonoscopy is a less sensitive means of detecting diverticula." - CMDT 2007\n\nDiverticulosis refers to the presence of multiple diverticula\nDiverticulitis refers to inflammation and infection associated with a diverticulum.\n\nBest investigation for\nDiverticulosis - Barium enema\nDiverticulitis - CT scan\n\nOn barium, enema diverticulosis shows characteristic \'sawtooth\' appearance', 'role': 'assistant'}]