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
"Microsomia" is defined as – 
Select and explain. 
A. Birth weight below 90th percentile, B. Birth weight below 10th percentile, C. Birth weight below 20th percentile, D. Birth weight below 50th percentile
B: Birth weight below 10th percentile
Answer: B: Birth weight below 10th percentile 
Explanation: Microsomia means small for date baby, i.e. newborn baby with a birth weight less than 10th percentile.