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': 'Clinical features of pyloric stenosis in infants are All /Except \nSelect and explain. \nA. Abdominal lump, B. Constipation, C. Weight loss, D. Metabolic acidosis', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Metabolic alkalosis, not acidosis is seen in hypertrophic pyloric stenosis due to loss of hydrogen ions in repeated vomiting.\nAs the hypertrophic pyloric stenosis progresses, complete gastric outlet obstruction occurs and not even clear fluids are able to pass. This leads to constipation or passage of small green "starvation" stools.\nRapid weight loss is seen if the condition is not detected early and treated.', 'role': 'assistant'}]