This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Disorders of Pubey, Subject name: Pediatrics
Precocious pubey in a girl is defined as breast development before the age of? 
Select and explain. 
A. 6 years, B. 8 years, C. 12 years, D. 10 years
B: 8 years
Answer: B: 8 years 
Explanation: Precocious pubey: Precocious pubey is defined by the onset of secondary sexual characteristics before the age of 8 years in girls and 9 years in boys.