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': 'Earliest indication of sexual maturation in females: \nSelect and explain. \nA. Menarche, B. Thelarche, C. Pubarche, D. Genital maturation', 'role': 'user'}, {'content': "Answer: B \nExplanation: b. Thelarche(Ref: Nelson's 20/e p 926-929)Earliest indication of sexual maturation in females is thelarche, while in males, it is testicular enlargement.", 'role': 'assistant'}]