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: 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. is 'd' i.e., Congenital pyloric stenosis", 'role': 'assistant'}]