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
Colonic diverticulosis is best diagnosed by 
Select and explain. 
A. Colonoscopy, B. Nuclear scan, C. Barium enema, D. CT scan
C: Barium enema
Answer: C: Barium enema 
Explanation: "Diverticula are best seen on barium enema. Colonoscopy is a less sensitive means of detecting diverticula." - CMDT 2007

Diverticulosis refers to the presence of multiple diverticula
Diverticulitis refers to inflammation and infection associated with a diverticulum.

Best investigation for
Diverticulosis - Barium enema
Diverticulitis - CT scan

On barium, enema diverticulosis shows characteristic 'sawtooth' appearance