This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Abdominal wall ,Inguinal and Femoral region, Subject name: Anatomy
A 45 year old male presents to OPD with with acute abdominal pain . On examination it seems to have spread to retroperitoneal structures . Which of the following is the most likely to get affected 
Select and explain. 
A. Stomach, B. Transverse colon, C. Jejunum, D. Descending colon
D: Descending colon
Answer: D: Descending colon 
Explanation: The descending colon is a retroperitoneal organ. The rest of the organs are surrounded by peritoneum. Other retroperitoneal organs are: - Pancreas, Duodenum, Ascending colon, Descending colon, Middle third of the rectum Image showing Pancreas and Duodenum lying retroperitoneally.