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': 'Make the diagnosis of a 26 day old infant presenting with recurrent nonbilious vomiting with costipation and loss of wt- \nSelect and explain. \nA. Oesophageal atresia, B. Choledochal cyst, C. Heal atresia, D. Pyloric stenosis', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]