First sign of puberty in girls:
Ans. is 'b' i.e., Tbelarchy * 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 1/2 yr.
Puberchy
Thelarchy
Growth spurt
Menarche
Growth, Development, and Behavior