This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Neonatal Resuscitation, 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: Bag & mask ventilation - avoided in Congenital diaphragmatic hernia It enlarges the stomach and small bowel & makes oxygenation more difficult.', 'role': 'assistant'}]