Which gland is known to be associated with hair follicles?

The sebaceous gland is indeed the correct answer because it plays a crucial role in relation to hair follicles. These glands are microscopic exocrine glands located in the skin and are typically found adjacent to hair follicles. Their primary function is to secrete an oily substance called sebum, which lubricates the hair and skin, preventing them from becoming dry and brittle. The sebum produced by the sebaceous glands also has antimicrobial properties, helping to protect the skin from infections.

The other glands listed do not have a direct association with hair follicles. The thyroid gland primarily regulates metabolism through the secretion of thyroid hormones, while the adrenal gland is involved in producing hormones related to stress response, among other functions. The pituitary gland, often referred to as the "master gland," controls various endocrine functions but is not directly linked to hair follicles. Thus, the sebaceous gland's direct connection to hair follicles through its functional role in maintaining skin and hair health makes it the correct response to the question.