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
The commonest cause of vomiting in a one month old infant is - 
Select and explain. 
A. Pyloric stenosis, B. Cardiac chalasia, C. Aerophagy, D. Gastro-esophageal reflux
C: Aerophagy
Answer: C: Aerophagy 
Explanation: Ans. is 'c' i.e., Aerophagy