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: Pathology
[{'content': 'Commonest sites of intraabdominal abscess - \nSelect and explain. \nA. Subphrenic, B. Paracolic, C. Pelvis, D. Retroperitoneal', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Pelvis is the commonest site of intraabdominal abscess because of 2 reasons.\n\nBecause the vermiform appendix is often pelvic in position.\nBecause the fallopian tubes are frequent sites of infection.', 'role': 'assistant'}]