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
Order of development of secondary sexual characteristic in male – 
Select and explain. 
A. Testicular development–pubic hair–axillary hair–beard, B. Pubic hair–testicular development–axillary hair – beard, C. Testicular development –beard–pubic hair–axillary hair, D. Axillary hair–beard –pubic hair–testicular development
A: Testicular development–pubic hair–axillary hair–beard
Answer: A: Testicular development–pubic hair–axillary hair–beard 
Explanation: In boys, the first visible sign of puberty and the hallmark of SMR 2 is testicular enlargement.
The sequence of development of secondary sexual characteristic in boys is -

Testicular enlargement —> Penis enlargement > Pubic hair growth --> Peak growth velocity —> Axillary hair —> facial hair.