Which gland is referred to as the mammary or milk gland on the body?

The gland referred to as the mammary or milk gland in the body is the breast. This structure is responsible for producing and secreting milk, primarily in females during lactation. The mammary glands are specialized organs that undergo significant changes during puberty, pregnancy, and after childbirth to prepare for and support breastfeeding. They are composed of glandular tissue that can produce milk, as well as adipose (fat) tissue that provides protection and structural support.

In contrast, the other options represent different types of glands with distinct functions. The ovary produces eggs and hormones that regulate the female reproductive system; the testis is involved in producing sperm and male hormones; and the prostate gland contributes to the fluid that nourishes and transports sperm. Each of these glands plays important roles in the reproductive systems of males and females but does not function as a milk-producing gland like the breast.