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
Clinical features of pyloric stenosis in infants are All / Except 
Select and explain. 
A. Abdominal lump, B. Constipation, C. Weight loss, D. Metabolic acidosis
D: Metabolic acidosis
Answer: D: Metabolic acidosis 
Explanation: Ans. is 'd' i.e. metabolic acidosis Metabolic alkalosis, not acidosis is seen in hyperophic pyloric stenosis due to loss of hydrogen ions in repeated vomiting. As the hyperophic pyloric stenosis progresses, complete gastric outlet obstruction occurs and not even clear fludis are able to pass. This leads to constipation or passage of small green "starvation" stools. Rapid weight loss is seen if the condition is not detected early and treated.