This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Pediatrics
[{'content': 'Sign of pubey in boys is \nSelect and explain. \nA. Enlargement of penis, B. Enlargement of testes, C. Appearance of pubic hair, D. Appearance of axillary hair', 'role': 'user'}, {'content': "Answer: B \nExplanation: In girls, the first visible sign of pubey is the appearance of breast buds (Thelarche), between 8-12 years of ageIn boys the first visible sign of pubey is testicular enlargement, beginning as early as 9 1/2 yr.(Refer: Nelson's Textbook of Pediatrics, SAE, 1st edition, pg no. 926)", 'role': 'assistant'}]