What type of gland is attached to hair follicles and found in the groin and underarms?

Apocrine glands are specialized sweat glands located primarily in areas of the body where hair follicles are present, such as the groin and underarms. These glands play a significant role in the body's regulation of temperature and in the process of scent production due to the breakdown of their secretions by bacteria on the skin's surface. The secretions of apocrine glands are thicker and contain proteins and lipids, which contribute to their unique odor, especially when they are metabolized by skin bacteria.

Eccrine glands, in contrast, are found all over the body and are responsible for regulating body temperature through the secretion of a more watery and less odorous sweat. Sebaceous glands are associated with hair follicles as well but they produce sebum, an oily substance that helps to moisturize the skin and hair, rather than sweat. Exocrine glands is a broader category that includes both eccrine and apocrine glands, but does not specifically denote those that produce sweat in relation to hair follicles in the groin and underarms. The specificity of apocrine glands to these locations, coupled with their distinct secretion characteristics, makes them the correct answer for this question.