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
First sign of sexual maturity in boys is: September 2010 
Select and explain. 
A. Increase in height, B. Increase in facial hairs, C. Testicular enlargement, D. Axillary hairs
C: Testicular enlargement
Answer: C: Testicular enlargement 
Explanation: 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