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': '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: Hypochloremic alkalosis develops due to vomiting. Ref: Text Book of Pediatrics By Nelson, 19th Edition, Page 1274; Bailey and Love's Sho Practice of Surgery, 22nd Edition, Page 674 and 23rd Edition, Page 899.", 'role': 'assistant'}]