This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Adolescence, Subject name: Pediatrics
[{'content': 'Penile growth occurs during SMR stage \nSelect and explain. \nA. 1, B. 2, C. 3, D. 4', 'role': 'user'}, {'content': 'Answer: C \nExplanation: In males, the first visible sign of pubey and the hallmark of SMR2 is the testicular enlargement. Penile growth occurs during stage 3.Reference: Nelson Textbook of Paediatrics; 20th edition', 'role': 'assistant'}]