This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Peritoneum, Subject name: Surgery
Commonest site of intraperitoneal abscess is: 
Select and explain. 
A. Lesser sac, B. Greater sac, C. Pelvis, D. Paracolic gutter
C: Pelvis
Answer: C: Pelvis 
Explanation: Commonest site of intraperitoneal abscess is Pelvis. C/F - Pain in lower abdomen , chills and rigor, fever Irritates the rectum - Multiple episodes of loose stool with mucous On digital Rectal exam -Bulge on anterior wall of rectum