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
Make the diagnosis of a 26 day old infant presenting with recurrent nonbilious vomiting with costipation and loss of wt- 
Select and explain. 
A. Oesophageal atresia, B. Choledochal cyst, C. Heal atresia, D. Pyloric stenosis
D: Pyloric stenosis
Answer: D: Pyloric stenosis 
Explanation: None