Which type of glands are known to contribute to body odor?

Apocrine glands are the primary contributors to body odor. These glands are primarily found in areas with abundant hair follicles, such as the armpits and groin. They secrete a viscous fluid that, when broken down by bacteria on the skin's surface, can produce various odors. This process is often influenced by factors such as stress, hormones, and diet.

Eccrine glands differ in functionality; they are responsible for regulating body temperature through the secretion of a watery sweat that does not have a significant odor. While sebaceous glands can contribute to skin conditions and have an oily secretion, they do not directly cause body odor. Mammary glands are primarily involved in milk production and do not play a role in body odor at all.

Therefore, the primary role of apocrine glands in producing sweat that is prone to bacterial breakdown and subsequent odor makes them the correct choice for this question.