At what Tanner stage does adult breast contour and pubic hair spread to the medial thighs occur?

The correct answer is associated with Tanner stage 5, which represents the final stage of sexual maturation in females. At this stage, adult breast contour is fully developed, indicating that the breasts have reached their mature form with pronounced features. Additionally, pubic hair distribution has progressed to the medial thighs, demonstrating a further advancement beyond the initial stages of pubic hair development.

In Tanner stages, each progression marks significant changes in the body as it matures. Stage 5 is characterized by a complete external maturation, including not just breast development and pubic hair growth, but also an overall readiness for reproductive capability. This maturity reflects the culmination of physical development that occurs throughout the Tanner stages, specifically designed to be distinct from earlier phases where these features are not as prominent.

Other stages do display changes in breast and pubic hair development, but they do not reach the mature contour or the extensive hair spread seen at stage 5, which solidifies it as the stage representing full development.