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': 'First sign of sexual maturity in boys is: September 2010 \nSelect and explain. \nA. Increase in height, B. Increase in facial hairs, C. Testicular enlargement, D. Axillary hairs', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Ans. C: Testicular Enlargement In boys, testicular enlargement is the first physical manifestation of pubey (and is termed gonadarche). Testes in prepubeal boys change little in size from about 1 year of age to the onset of pubey, averaging about 2-3 cm in length and about 1.5-2 cm in width. Testicular size continues to increase throughout pubey, reaching maximal adult size about 6 years after the onset of pubey', 'role': 'assistant'}]