What is the function of androgen?

Stimulate spermatogenesis.

The correct answer is Option (2)- Stimulate spermatogenesis.

Spermatogenesis starts at the age of puberty due to significant increase in the secretion of gonadotropin releasing hormone (GnRH). This, if you recall, is a hypothalamic hormone. The increased levels of GnRH then acts at the anterior pituitary gland and stimulates secretion of two gonadotropins – luteinising hormone (LH) and follicle stimulating hormone (FSH). LH acts at the Leydig cells and stimulates synthesis and secretion of androgens. Androgens, in turn, stimulate the process of spermatogenesis.

Androgens also contribute to other functions such as the development of male secondary sexual characteristics (e.g., deepening of voice, body hair growth, muscle development), regulating libido (sex drive), and influencing overall body metabolism.