This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: G.I.T, Subject name: Surgery
[{'content': 'What is the most common cause of gastric outlet obstruction in a 4-week-old baby \nSelect and explain. \nA. Annular pancreas, B. Foreign body, C. Congenital hyperophic pyloric stenosis, D. Duodenel atresia', 'role': 'user'}, {'content': 'Answer: C \nExplanation: It is seen between 3rd and 6 the week of age of an infant because it&;s the time taken by the hyperophied muscle to cause complete obstruction. SRB edition 5th page no: 821', 'role': 'assistant'}]