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: Physiology
A child is below the third percentile for height. 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: None