**Core Concept**
The relationship between serum cholesterol levels and coronary heart disease (CHD) risk is a well-established principle in cardiology. High levels of low-density lipoprotein (LDL) cholesterol are associated with increased CHD risk, while high levels of high-density lipoprotein (HDL) cholesterol are associated with decreased CHD risk.

**Why the Correct Answer is Right**
The inverse relationship between HDL cholesterol concentration and CHD risk is due to the role of HDL in reverse cholesterol transport, where it helps remove excess cholesterol from peripheral tissues and transport it to the liver for excretion. This process reduces the amount of cholesterol available for deposition in arterial walls, thereby decreasing the risk of atherosclerotic plaque formation and subsequent CHD events. HDL also has anti-inflammatory and antioxidant properties that contribute to its protective effects.

**Why Each Wrong Option is Incorrect**
* **Option A:** This option is incorrect as LDL cholesterol is directly related to increased CHD risk, not inversely related. High levels of LDL cholesterol are associated with increased atherosclerosis and CHD events.
* **Option B:** This option is incorrect as triglycerides are a type of lipoprotein that, when elevated, can increase CHD risk, but they are not inversely related to CHD risk in the same way that HDL cholesterol is.
* **Option C:** This option is incorrect as very-low-density lipoprotein (VLDL) cholesterol is a type of lipoprotein that, when elevated, can increase CHD risk, but it is not inversely related to CHD risk in the same way that HDL cholesterol is.

**Clinical Pearl / High-Yield Fact**
The "good" cholesterol, HDL, helps remove excess cholesterol from the bloodstream, reducing the risk of atherosclerosis and CHD events. A high HDL level (>60 mg/dL) is considered protective, while a low HDL level (<40 mg/dL) is considered a risk factor for CHD. **Correct Answer:** B. Triglycerides