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: Pediatrics
A preterm baby is born with synchronised upper chest movement, minimal nasal flare, expiratory grunting heard by the stethoscope, but has no chest or xiphoid retractions. The Silverman score is: 
Select and explain. 
A. 1, B. 2, C. 3, D. 4
B: 2
Answer: B: 2 
Explanation: The Silverman Anderson retraction score of respiratory distress syndrome (RDS): Upper chest Lower chest Xiphoid retraction Nares dilatation Expiratory grunt Grade 0 Synchronised No retraction None None None Grade 1 Lag on inspiration Just visible Just visible Minimal By stethoscope Grade 2 See-saw Marked Marked Marked Without stethoscope Mild RDS: Score 1-3 Moderate RDS: 4-7 Severe RDS: 7-10 Ref: Advances in Pediatrics by Dutta By Jaypee Brothers, Medical Publishers, 2007, Page 89.