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: Radiology
Typical "Saw-tooth" colon on barium enema is seen with – 
Select and explain. 
A. Colonic diverticulosis, B. Colonic volvulus, C. Colonic carcinoma, D. Ulcerative colitis
A: Colonic diverticulosis
Answer: A: Colonic diverticulosis 
Explanation: None