Q: What oily substance prevents the hair and skin of living things from drying out?


Read this paragraph and choose the correct option from the provided answers:

Sebaceous glands are commonly called oil glands. They produce an oily substance called sebum. Sebum is secreted into hair follicles. Then it makes its way along the hair shaft to the surface of the skin. Sebum waterproofs the hair and skin and helps prevent them from drying out.

 Choices:

- pus

- progesterone

- pancreatic enzymes

- sebum


A:
sebum