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: Medicine
[{'content': 'A 2-day-old newborn is brought to the physician because of vomiting. Physical examination shows a small mass about the size of an olive in the epigastric area. \n\nWhich of the following conditions is this child likely to exhibit? \nSelect and explain. \nA. Biliary stenosis, B. Duodenal atresia, C. Non-bilious vomiting, D. Pancreas divisum', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]