This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Stomach & Duodenum, Subject name: Surgery
[{'content': "Ramsted's operation is for: \nSelect and explain. \nA. Duodenal atresia, B. Volvulus of small intestine, C. Anorectal malformation, D. Congenital pyloric stenosis", 'role': 'user'}, {'content': 'Answer: D \nExplanation: Ans: d (Congenital pyloric stenosis)Ref: Bailey & Love, 24th ed, p. 1033 & 23rd ed, p. 900', 'role': 'assistant'}]