Which gland produces sebum for lubricating hair and skin?

Sebaceous glands are specialized exocrine glands located in the skin that are responsible for producing sebum, an oily substance that lubricates and waterproofs both hair and skin. Sebum plays a crucial role in maintaining the health of the skin, providing a protective barrier against moisture loss and environmental factors. This oily secretion also has antimicrobial properties, helping to prevent infections by inhibiting the growth of certain bacteria and fungi on the skin's surface.

In contrast, sweat glands, which include apocrine and eccrine types, primarily function in thermoregulation and excretion of waste through perspiration. While they do contribute to skin hydration indirectly, they do not produce sebum. Apocrine glands, found primarily in areas like the armpits and groin, secrete a thicker fluid that can develop an odor when it interacts with bacteria on the skin, but they also do not produce sebum. Eccrine glands primarily secrete a watery sweat for cooling and are not involved in lubrication.

Thus, the specific role of sebaceous glands in producing sebum makes them the correct answer in this context.