This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Pubey and Adolescent Health, Subject name: Pediatrics
[{'content': 'In boys which is the first visible sign of pubey? \nSelect and explain. \nA. Testicular enlargement, B. Penile growth, C. Breast hyperophy, D. Dark scrotum', 'role': 'user'}, {'content': 'Answer: A \nExplanation: In boys- first visible sign of pubey is testicular enlargement. While in girls, the first sign of pubey is thelarche or breast development.', 'role': 'assistant'}]