Cholesterol is best described as which of the following?

• A. A protein
• B. A carbohydrate
• C. A mineral
• D. One of the sterols, manufactured in the body for a variety of purposes

Answer: (D)

Cholesterol is a sterol, a lipid produced by the body that serves many roles. Sterols are a specialized type of lipid with a ring structure and a hydroxyl group, and cholesterol is synthesized mainly in the liver to be used in multiple essential processes. It helps form and maintain cell membranes, and serves as a precursor for bile acids, steroid hormones, and vitamin D. It is not a protein (made from amino acids), not a carbohydrate (sugars), and not a mineral (an inorganic element). Describing it as a sterol synthesized in the body for a variety of purposes best captures its chemical class and functions.