This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Growth, Development, and Behavior, Subject name: Pediatrics
A child is below the third percentile for height. His growth velocity is normal, but chronologic age is more than skeletal age. The most likely diagnosis is: 
Select and explain. 
A. Constitutional delay in growth, B. Genetic short stature, C. Primordial dwarfism, D. Hypopituitarism
A: Constitutional delay in growth
Answer: A: Constitutional delay in growth 
Explanation: a. Constitutional delay in growth(Ref: Nelson's 20/e p 2643, Ghai 8/e p 35-37)The child in this Question has: Height below 3rd percentile, i.e., short stature.Normal growth velocity, i.e., normal variant of short stature and Skeletal age is less than chronological age.So, this child has Constitutional delay in growth.