**Core Concept**
Fibrates are a class of medications used to lower triglyceride levels and increase high-density lipoprotein (HDL) cholesterol in the blood. They work by activating peroxisome proliferator-activated receptor-alpha (PPAR-alpha), which regulates the expression of genes involved in lipid metabolism.

**Why the Correct Answer is Right**
The primary stage treatment of hypertriglyceridemia often involves fibrates, such as fenofibrate or gemfibrozil. These medications activate PPAR-alpha, leading to increased lipolysis and clearance of triglyceride-rich lipoproteins. This results in a decrease in very-low-density lipoprotein (VLDL) and triglyceride levels. Fibrates also increase HDL cholesterol levels by stimulating the expression of apolipoprotein A-1 (apoA-1).

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect as statins, such as atorvastatin, primarily lower low-density lipoprotein (LDL) cholesterol and are not the first-line treatment for hypertriglyceridemia.
**Option B:** This option is incorrect as omega-3 fatty acids, such as fish oil, are used to treat hypertriglyceridemia but are not the primary stage treatment.
**Option C:** This option is incorrect as niacin is used to treat hypertriglyceridemia but is not typically used as a first-line agent.

**Clinical Pearl / High-Yield Fact**
Fibrates can also be used to treat mixed dyslipidemia, which is characterized by elevated triglyceride levels and low HDL cholesterol.

**Correct Answer: B. Omega-3 fatty acids are used in the primary stage treatment of hypertriglyceridemia.