This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Pediatrics
[{'content': '1st Visible sign of puberty in males is \nSelect and explain. \nA. Testicular enlargement > 3ml in Stage III, B. Testicular enlargement > 4ml in Stage II, C. Growth of penis, D. Testicular enlargement > 3ml in Stage I', 'role': 'user'}, {'content': "Answer: B \nExplanation: Tanner's staging in Males\nStage I :\nTesticular size < 4ml\nStage II :\xa0\nSparse hair growth\nScrotum and testis (>4ml) enlarge\nStage III : \nHair growth darkens\nPenis grows in lenght\nStage IV :\nHair growth becomes dense and coarse\nScrotum and penis continues to grow\nGrowth spurt occurs\nStage V :\nHair growth extend to inner thigh\nGenitalia reaches adult size", 'role': 'assistant'}]