This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Growth, Development, and Behavior, Subject name: Pediatrics
[{'content': 'First sign of puberty in girls: \nSelect and explain. \nA. Puberchy, B. Thelarchy, C. Growth spurt, D. Menarche', 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. is 'b' i.e., Tbelarchy * In girls, the first visible sign of puberty is the appearance of breast buds (Thelarche), between 8-12 years of age.* In boys the first visible sign of puberty is testicular enlargement, beginning as early as 9 1/2 yr.", 'role': 'assistant'}]