<prompt> The first visible sign of puberty in boys -Enlargement of penisEnlargement of testesAppearance of pubic hairAppearance of axillary hair  <response>: Ans. is b i.e., Enlargement of testes o In girls, the first visible sign of puberty is the appearance of breast buds Thelarche, between 8-12 years of age. In boys the first visible sign of puberty is testicular enlargement, beginning as early as 9 12 yr 