**Core Concept**
High-density lipoprotein (HDL) plays a crucial role in reverse cholesterol transport, removing excess cholesterol from peripheral tissues and transporting it to the liver for excretion. HDL's concentration is inversely related to the risk of coronary heart disease (CHD), making it a protective factor against atherosclerosis.

**Why the Correct Answer is Right**
The inverse relationship between HDL concentration and CHD risk is attributed to HDL's role in promoting cholesterol efflux from peripheral tissues, such as macrophages and smooth muscle cells, and its ability to inhibit the formation of foam cells, a key step in the development of atherosclerotic plaques. HDL's antioxidant properties also help protect against oxidative stress and inflammation, further reducing the risk of CHD. The enzyme lecithin-cholesterol acyltransferase (LCAT) is responsible for converting free cholesterol into cholesteryl esters, which are then transported to the liver by HDL.

**Why Each Wrong Option is Incorrect**
**Option A:** VLDL (very-low-density lipoprotein) is involved in the transport of endogenous triglycerides and cholesterol from the liver to peripheral tissues, and high levels of VLDL are associated with increased risk of CHD.

**Option B:** LDL (low-density lipoprotein) is often referred to as "bad" cholesterol, as high levels of LDL can lead to the accumulation of cholesterol in arterial walls, increasing the risk of atherosclerosis and CHD.

**Option D:** None is incorrect because one of the options (C. HDL) is indeed inversely related to the risk of CHD.

**Clinical Pearl / High-Yield Fact**
The level of HDL cholesterol is often referred to as the "good" cholesterol, and it is a strong predictor of cardiovascular risk. A high level of HDL (>60 mg/dL) is associated with a lower risk of CHD, while a low level (<40 mg/dL) is associated with an increased risk.

**✓ Correct Answer: C. HDL. High-density lipoprotein (HDL) is inversely related to the risk of coronary heart disease.**