This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Unknown
[{'content': 'The operation of choice for the below condition \nSelect and explain. \nA. Division of annular ring, B. Gastrojejunostomy, C. Duodenojejunostomy, D. Pancreaticoduodenal tom', 'role': 'user'}, {'content': 'Answer: C \nExplanation: The treatment of annular pancreas is duodenojejunostomy or gastrojejunostomy either of which bypasses the obstruction.\nAccording to Bailey and Love duodenoduodenostomy or duodenojejunostomy are usual operation. Obstructing pancreatic ring must not be simply divided. Since this may not relieve the obstruction and pancreatic fistula may result.\nAnnular pancreas is formed by a thin band of normal pancreas tissue that completely encircles the second portion of duodenum and is continuous with head of pancreas anteriorly and posteriorly. 40% patients have associated duodenal stenosis or atresia.\nSymptoms of duodenal obstruction (gastric distention and vomiting) occur in about one third of cases in the first week of life and about one half of cases in the first year. Rests are asymptomatic until adulthood, when abdominal pain, nausea and vomiting may occur.', 'role': 'assistant'}]