Which organ primarily produces cholesterol in the body?

• A. Liver
• B. Lungs
• C. Heart
• D. Kidneys

Answer: (A)

Cholesterol is produced primarily in the liver. The liver carries out de novo synthesis of cholesterol from acetyl-CoA through the mevalonate pathway, with the enzyme HMG-CoA reductase acting as the key rate‑limiting step. This organ not only makes cholesterol but also packages it into VLDL for transport through the bloodstream and converts excess cholesterol into bile acids for digestion. While other tissues can make some cholesterol, their output is much smaller, so the liver stands out as the main source. This is why factors that affect hepatic cholesterol production—like liver health or drugs that inhibit HMG-CoA reductase (statins)—have a strong influence on blood cholesterol levels.