This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Endocrinology, Subject name: Medicine
[{'content': "Advanced bone age is seen in all except- \nSelect and explain. \nA. Marfan's syndrome, B. Congenital adrenal hyperplasia, C. Precocious pubey, D. Obesity", 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ref - clinicaladvisor.com', 'role': 'assistant'}]