This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: New Born Infants, Subject name: Pediatrics
[{'content': 'Definite contraindication for bag and mask ventilation is: \nSelect and explain. \nA. Cleft lip, B. Cleft palate, C. Congenital diaphragmatic hernia, D. Umbilical hernia', 'role': 'user'}, {'content': 'Answer: C \nExplanation: c. Congenital diaphragmatic hernia(Ref: AAP guidelines 2015, Ghai 8/e p 126-133)Bag & mask ventilation should be avoided in Congenital diaphragmatic hernia, because it enlarges the stomach and small bowel and thus makes oxygenation more difficult.', 'role': 'assistant'}]