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: Pediatrics
Vomiting on the first day of baby's life may be caused by all of the following except- 
Select and explain. 
A. Pyloric stenosis, B. Oesophageal atresia, C. Aerophagy, D. Amniotic gastritis
A: Pyloric stenosis
Answer: A: Pyloric stenosis 
Explanation: Ans. is 'a' i.e., Pyloric stenosis