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A
Sudoriferous (sweat) glands
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B
Sebaceous (oil) glands
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C
Lymph glands
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D
Thyroid glands
Why this is the answer
Sebaceous glands are the oil-producing glands of the skin; they secrete sebum, an oily substance that lubricates the skin and hair and helps form a protective barrier. The sudoriferous glands, by contrast, are the sweat glands, which help regulate body temperature and excrete some waste. Both are found in the dermis. Overactive sebaceous glands can contribute to oily skin and clogged pores. Knowing the two main types of skin glands and what they produce is part of basic skin science on the exam.
Source: Scientific Concepts — Skin Glands