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: 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.