Oily skin is a result of overproduction by which of the following?

Oily skin is primarily the result of overproduction of sebum, which is an oily substance secreted by the sebaceous glands. These glands are connected to hair follicles and are distributed throughout the skin, particularly abundant on the face and scalp. When sebaceous glands produce excess sebum, it can lead to a shiny complexion and contribute to clogged pores, which may result in acne and other skin issues. Understanding the role of sebaceous glands is crucial for managing oily skin effectively, as treatments often focus on balancing oil production and keeping the skin clear of excess sebum. The other options relate to different aspects of skin biology; for example, while sweat glands do secrete a fluid that can also contribute to skin moisture, they do not produce oil.