Which hormone in mammals causes the emergence of masculine sexual characteristics?
Estrogen
Progesterone
Testosterone
Follicle-stimulating hormone (FSH)
The hormone responsible for the development of male sexual characteristics in mammals is testosterone. Testosterone is primarily produced by the testes in males and plays a vital role in the development and maintenance of male reproductive organs, secondary sexual characteristics (such as facial and body hair, deepening of voice, and muscle development), and male-specific behaviors. Estrogen and progesterone are the primary female sex hormones, and follicle-stimulating hormone (FSH) is involved in the regulation of reproductive processes but is not directly responsible for the development of male sexual characteristics.
Option 3 is the correct answer.