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
The most common cause of short stature is – 
Select and explain. 
A. Constitutional, B. Systemic diseases, C. Hypothyroidism, D. Growth hormone deficiency
A: Constitutional
Answer: A: Constitutional 
Explanation: Constitutional delay in growth

This is significant cause of short stature in mid childhood period but the ultimate height is normal.
Their birth weight and height are normal.
Strong family history of parents having short stature in childhood with delay in onset of puberty is usually present.
The average growth velocity is normal and ultimate growth potential is adequate.
The bone age is less than chronological age.
Upper segment and lower segement ratio is normal.
Growth hormone and gonadotropin level after puberty are within normal range.
No treatment is required. The parents need to be reasured.