Which of the following signifies the onset of adolescence?

Question

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Puberty marks the beginning of adolescence. It is a process that involves the physical changes that occur as a child's body transitions towards reproductive maturity. These changes include the onset of menstruation, the development of breasts, the growth of pubic and underarm hair, and a growth spurt. Along with these physical changes, there are also significant changes in social, emotional, and cognitive development that occur during adolescence.

Which of the Following Signifies the Onset of Adolescence