Commonest sites of intraabdominal abscess -: (A) Subphrenic, (B) Paracolic, (C) Pelvis, (D) Retroperitoneal
Answer is C. Pelvis is the commonest site of intraabdominal abscess because of 2 reasons.

Because the vermiform appendix is often pelvic in position.
Because the fallopian tubes are frequent sites of infection.