First sign of puberty in girls is–

Correct option is A

Sol. The first visible sign of puberty in girls is usually the development of breast buds, medically known as thelarche. This change is stimulated by rising estrogen levels and typically begins around 8–11 years of age. Other signs like pubic hair and height spurt follow in later stages.
Explanation of each option:
· (a) Breast bud development – Correct answer. It is the earliest secondary sexual characteristic to appear and marks the beginning of puberty in girls. This happens before menstruation or height spurt.
· (b) Pubic hair – This develops a bit later, typically during the middle stages of puberty, and follows breast bud formation.
· (c) Height spurt – The growth spurt usually begins after breast development and pubic hair starts, and peaks around menarche.
· (d) Axillary hair – It is a late sign of puberty, generally appearing around or after menarche and often considered one of the last changes.