This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Medicine
[{'content': 'What is true regarding congenital hyperophic pyloric stenosis \nSelect and explain. \nA. More common in girls, B. Hypochloremic alkalosis, C. Hellers myotomy is the procedure of choice, D. Most often manifests at bih', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Congenital hyperophic pyloric stenosis is more common in first born males.Symptoms usually sta after 3 weeks of age.Non-bilious vomiting is the initial symptom. After vomiting, the infant becomes hungry and wants to feed again.The metabolic disturbance is hypochloremic metabolic alkalosis.Clinical diagnosis is by palpation of hyperophic mass, confirmed by USG.The surgical procedure of choice is Ramstedt pylorotomy.Ref: Nelson 17th/e p1229', 'role': 'assistant'}]