This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Stomach & Duodenum, Subject name: Surgery
What is the most characteristic of congenital hypertrophic pyloric stenosis? 
Select and explain. 
A. Affects the first born female child, B. The pyloric tumor is best felt during feeding, C. The patient is commonly marasmic, D. Loss of appetite occurs early
B: The pyloric tumor is best felt during feeding
Answer: B: The pyloric tumor is best felt during feeding 
Explanation: Ans. (b) The pyloric tumour is best felt during feedingRef: Sabiston 20th Edition, Page 1869* Baby is not marasmic. It feeds vigorously in between the episodes of vomiting