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
'Scalloping' of the edge of sigmoid colon on barium enema seen in: 
Select and explain. 
A. Diveiculosis, B. Ulcerative colitis, C. Carcinoma colon, D. Pneumatosis intestinalis
D: Pneumatosis intestinalis
Answer: D: Pneumatosis intestinalis 
Explanation: Ans. Pneumatosis intestinalis