The correct answer is (c) Steroids.
Cholesterol is a type of steroid, which is a specific class of lipids. It is an essential molecule found in animal cell membranes and is involved in various physiological processes in the body. Cholesterol is also a precursor for the synthesis of important molecules such as steroid hormones, bile acids, and vitamin D. While cholesterol is a type of lipid, it is not classified as a membrane lipid, triglyceride, or adipose tissue.