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
Which of the following is true about constitutional delay in growth ? 
Select and explain. 
A. Neonates with constitutional delay show anomalies at birth, B. IGF–1 levels are low for chronological age, C. Bone age is normal, D. IGF–1 levels are low for bone age
B: IGF–1 levels are low for chronological age
Answer: B: IGF–1 levels are low for chronological age 
Explanation: In constitutional growth delay, IGF-1 levels tend to be low for chronological age but within the normal range for bone age.
Birth weight and height are normal.
Bone age is less than chronological age.