*This is a 65-year-old man who complains of left-sided lower abdominal pain for the past two days and bright red blood in his stool. The pain is getting progressively worse since then.*

*If left untreated, what can occur?*

A. Increase risk of developing colon cancer

B. Recurrence

C. Generalized peritonitis

D. Intestinal obstruction

E. Perforation of the bowel

F. Vitamin B12 deficiency

G. Toxic megacolon

H. Persistent clay-colored stool

I. Recurrent melena