This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Pancreas, Subject name: Surgery
[{'content': 'In Pylorus preserving type of Pancreaticoduodenectomy structure not resected is: \nSelect and explain. \nA. Pyloric antrum, B. CBD, C. Duodenum, D. None', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans. (a) Pyloric AntrumRef: Sabiston Page 1549/ 20th edition* Pylorus Preserving Pancreaticoduodenectomy - Pyloric antrum is preserved * In this surgery there is a reduced incidence of Post; pancreatectomy dumping and Bile reflux', 'role': 'assistant'}]