This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Peritoneum & GI Tract, Subject name: Anatomy
[{'content': 'Which of the following is retroperitoneal? \nSelect and explain. \nA. Small intestine, B. Pancreas, C. Appendix, D. Esophagus', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans: b) PancreasDuring development some organs grow into the peritoneal cavity and become intraperitoneal. Eg: Stomach, small intestine, liver, spleenSome organs develop behind the peritoneum and are called retroperitoneal organs like ureters and kidneySecondarily retroperitoneal organs are part of gastrointestinal tract begin as intraperitoneal organs then become attached to the abdominal wall during development. These are duodenum, pancreas, ascending colon and descending colon.INTRAPERITONEALRETROPERITONEALEsophagusDuodenumStomachPancreasJejunumAscending colonIleumDescendin colonCaecumUretersAppendixKidneySigmoid colonTransverse colon', 'role': 'assistant'}]