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
What is true regarding congenital hyperophic pyloric stenosis : 
Select and explain. 
A. More common in girls, B. Hypochloremic alkalosis, C. Hellers myotomy is the procedure of choice, D. Most often manifests at bih
B: Hypochloremic alkalosis
Answer: B: Hypochloremic alkalosis 
Explanation: 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.