This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Pediatrics
A newborn developed respiratory distress. Which of the following ors Respiratory distress syndrome? 
Select and explain. 
A. Onset of distress after 6 hrs of bih, B. Air bronchogram on chest x-ray, C. History of receiving antenatal coicosteroids, D. Term bih
B: Air bronchogram on chest x-ray
Answer: B: Air bronchogram on chest x-ray 
Explanation: The chest x-ray of an infant with RDS is characterized by atelectasis, air bronchograms, and a diffuse reticular granular pattern commonly referred to as "ground glass". The chest x-ray may progress to a complete "white out" with severe disease. Reference: GHAI Essential pediatrics, 8th edition