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B
Bile
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C
Sweat
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D
Thyroid
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Solution
The correct option is A Sebum Dermis is the middle layer of skin. It contains blood and lymph vessels, hair follicles, and sebaceous and sweat glands. Sebaceous glands also called oil glands produce sebum. Sebum is an oily substance composed of fat, cellular debris, and keratin. It protects and lubricates the skin surface that prevents its drying.