<prompt> A patient in th emergency room with road traffic accident has retroperitoneal bleed. Trauma to which of the following structures is the most likely cause of this bleed?JejunumLiverStomachPancreas  <response>: The pancreas is the most likely cause as it is a retroperitoneal structure. All the other structures listed are intraperitoneal. Relationship of viscera to the perritoneum : Intraperitoneal: Stomach, jejunum, ileum, cecum, appendix, transverse colon, sigmoid colon, liver, gallbladder and spleen. Retroperitoneal: Esophagusabdominal, duodenum2nd and 3rd segment, pancreas, kidneys, ureters, suprarenal gland, abdominal aoa and its branches, inferior venacava, and celiac plexus. Paially covered in the peritoneumalso considered as retroperitoneal: Ascending colon, descending colon, and rectum. Ref: Gray;s Anatomy Pgno: 1045 