This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: G.I.T, Subject name: Surgery
[{'content': 'In a case of hyperophic pyloric stenosis, the metabolic disturbance is \nSelect and explain. \nA. Respiratory alkalosis, B. Metabolic acidosis, C. Metabolic alkalosis with paradoxical aciduria, D. Metabolic alkalosis with alkaline urine', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Hyperophic metabolic acidosis Clinical features Infant is normal at bih, symptomatic between ages of 3-6 weeks Infants with HPS typically present with projectile nonbilious vomiting Visible gastric peristalsis may be seen as a wave of contraction from the upper left quadrant to the epigastrium The infants usually feed vigorously between episodes of vomiting Typical electrolyte abnormalities Hypochloremia Hypokalemia Metabolic acidosis with paradoxical aciduria Ref: Sabiston 20th edition Pgno : 1869', 'role': 'assistant'}]