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: Medicine
Advanced bone age is seen in all except 
Select and explain. 
A. Marfan's syndrome, B. Congenital adrenal hyperplasia, C. Precocious puberty, D. Obesity
A: Marfan's syndrome
Answer: A: Marfan's syndrome 
Explanation: None