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
Ramsted's operation is for: 
Select and explain. 
A. Duodenal atresia, B. Volvulus of small intestine, C. Anorectal malformation, D. Congenital pyloric stenosis
D: Congenital pyloric stenosis
Answer: D: Congenital pyloric stenosis 
Explanation: Ans: d (Congenital pyloric stenosis)Ref: Bailey & Love, 24th ed, p. 1033 & 23rd ed, p. 900