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: Surgery
Bag and mask ventilation in newborn resuscitation is contraindicated in: 
Select and explain. 
A. Diaphragmatic hernia, B. Pulmonary hypoplasia, C. Tracheo-oesophageal fistula, D. Laryngomalacia
A: Diaphragmatic hernia
Answer: A: Diaphragmatic hernia 
Explanation: Bag and mask ventilation is contraindicated in suspected or confirmed diaphragmatic hernia. It is done in: * If the infant is apnoeic/gasping * Respiration is spontaneous but hea rate is below 100/min. The capacity of the bag is 240 to 750 ml. It should be attached to O2 source (5 to 6 litres/min) so as to deliver 90- 100% oxygen.