Which statement about testosterone is false?

Testosterone is a male sex hormone primarily produced in the testes that plays a significant role in influencing sexual development and characteristics in males. It contributes to the development of secondary sexual characteristics, which include increases in muscle mass and strength, as well as changes in body composition.

The statement indicating that testosterone causes males to have a narrower pelvis compared to females is not accurate in the context of hormonal effects. While it is true that males generally have a narrower pelvis than females, this anatomical difference is primarily a result of evolutionary and developmental factors rather than a direct effect of testosterone. Hormones like testosterone are responsible for modulating physical characteristics, but the pelvic structure is fundamentally determined during the developmental stages influenced by genetics and overall biological sex differentiation patterns.

In contrast, the other statements about testosterone are accurate. It is indeed produced in the testes, plays a crucial role in male sexual development, and its effects can significantly influence muscle reach and strength.