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
Contraindication for bag and mask ventilation among the following is: 
Select and explain. 
A. Meconium aspiration, B. Tracheo esophageal fistula, C. Congenital lung cyst, D. Birth asphyxia
A: Meconium aspiration
Answer: A: Meconium aspiration 
Explanation: Ans: a (Meconium aspiration) Ref: O.P. Ghai, ed, p. 141"Bag and mask ventilation is contraindicated in suspected or confirmed diaphragmatic hernia, in non vigorous babies bom through meconium stained liquor, bag and mask ventilation is done only after tracheal suctioning."