This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Assessment of Growth, Subject name: Pediatrics
Which of the following-is the first sign of sexual maturity in boys? 
Select and explain. 
A. Increase in height, B. Appearance of facial hair, C. Change in voice, D. Increase in testicular size
D: Increase in testicular size
Answer: D: Increase in testicular size 
Explanation: Ans. (d) Increase in testicular sizePlease refer explanation of question 40