The correct answer is A. Mammary glands.
Endocrine glands are glands that secrete hormones directly into the bloodstream. Hormones are chemicals that regulate the body’s functions. Mammary glands are located in the breasts and produce milk to feed infants. Apocrine sweat glands are located in the armpits and groin and produce a type of sweat that contains fatty acids and proteins. Reproductive glands are located in the reproductive system and produce hormones that regulate reproduction. Salivary glands are located in the mouth and produce saliva, which helps to moisten food and begin the process of digestion.
Mammary glands are the only glands on this list that are endocrine glands. They secrete hormones directly into the bloodstream, which regulate the production of milk. Apocrine sweat glands, reproductive glands, and salivary glands are all exocrine glands. They secrete their products through ducts, which carry the products to the surface of the skin or into the digestive system.