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 hyperophic pyloric stenosis due to loss of hydrogen ions in repeated vomiting. Ref: Schwaz 9/e, Page 1426 ; Maingot's 10/e, Page 2067.", 'role': 'assistant'}]