Mammary glands are modified
a)	Sweat gland	b)	Sebaceous gland	c)	Lacrimal gland	d)	Endocrine gland

(a)

Mammary glands are modified sweat glands that lie over the pectoral muscle. They occur in all female mammals and in a rudimentary from in all male mammals. In the human female, the mammary glands start to increase in size at puberty because of fat accumulation and reach their maximum development in approximately the twentieth year. These undergo additional development during pregnancy essential function of mammary gland is milk production which has nutritive and immunologic properties.