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: Pediatrics
[{'content': 'Precocious puberty in girls is defined by the onset of secondary sexual characteristics before the age of: \nSelect and explain. \nA. 5 years, B. 7 years, C. 8 years, D. 9 years', 'role': 'user'}, {'content': "Answer: C \nExplanation: c. 8 years(Ref: Nelson's 20/e p 2656)Precocious puberty is defined by the onset of secondary sexual characteristics before the age of 8 yr in girls and 9 yr in boys.", 'role': 'assistant'}]