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
Central precocious puberty 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: b. 8 years(Ref: Nelson's 20/e p2656, Ghai 8/e p 534)Central precocious puberty is defined by onset of breast development before the age of 8 yrs in girls and by onset of testicular development (vol 4mL) before the age of 9 yrs in boys, as a result of early activation of hypothalamic-pituitary-gonadal axis.