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
Small for gestational age infants are defined as _______ 
Select and explain. 
A. Birth weight of child < 3rd percentile for gestational age, B. Birth weight of a child < 10th Percentile for gestational age, C. Birth weight of a child < 15th percentile for gestational age, D. Birth weight of a child < 25th percentile for gestational age.
B: Birth weight of a child < 10th Percentile for gestational age
Answer: B: Birth weight of a child < 10th Percentile for gestational age 
Explanation: Small for gestational age (SGA)
	Birth weight < 10th percentile for gestational age
Appropriate for gestational age (AGA)
	Birth weight 10th - 90th percentile for gestational age
Large for gestational age (LGA)
	Birht weight > 90th percentile for gestational age.