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
[{'content': 'Commonest cause of short stature in children \nSelect and explain. \nA. Under nutrition, B. Hypothyroidism, C. Familial short stature, D. Constitutional delay', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]