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
Which of the following will favour the diagnosis of RDS in newborn: 
Select and explain. 
A. Receipt of antenatal steroids, B. Air bronchogram in chest X-ray, C. Manifests after 6 hrs, D. Occurs after term gestation
B: Air bronchogram in chest X-ray
Answer: B: Air bronchogram in chest X-ray 
Explanation: b. Air bronchogram in chest X-ray(Ref: Nelson's 20/e p 850-857, Ghai 8/e p 169-170)Discussing about the options one by one,a.Receipt of antenatal steroidsNoAntenatal steroids protect against RDSb.Air bronchogram in chest X-rayYesAir bronchogram on Chest X-ray is a feature of RDSc.Manifests after 6 hrsNoRDS manifests soon after birth & not after 6 hoursd.Occurs after term gestationNoIt usually occurs in preterm neonates