Which of the following is a source of exogenous cholesterol?

Exogenous cholesterol refers to the cholesterol that is obtained from dietary sources. Meat is a primary source of exogenous cholesterol because it contains animal-derived products that contribute to cholesterol intake. Foods such as red meat, poultry, and fish are known to contain significant amounts of cholesterol, contributing to the overall dietary intake.

The other options refer to cholesterol that is synthesized or altered within the body. The liver produces cholesterol endogenously, which means that this cholesterol is created internally rather than sourced from food. The conversion of carbohydrates into cholesterol also occurs within the body and does not constitute exogenous cholesterol. Likewise, while gut bacteria can produce various substances, including certain fatty acids, they do not significantly manufacture cholesterol in forms that would be classified as exogenous. Thus, the correct answer highlights the direct dietary source of cholesterol, specifically meat.