**Core Concept**
Fibric acid derivatives and statins are commonly used in the management of hypertriglyceridemia and low HDL cholesterol. However, they have distinct side effect profiles, including the risk of myositis with statins and fibric acid derivatives, particularly when used in combination. Nicotinic acid, also known as niacin, is a distinct class of lipid-lowering agents that can also raise HDL cholesterol.

**Why the Correct Answer is Right**
Nicotinic acid works by inhibiting the breakdown of adipose tissue triglycerides to free fatty acids, thereby reducing the release of free fatty acids into the bloodstream. This action decreases the hepatic production of very-low-density lipoprotein (VLDL) and increases the clearance of VLDL and low-density lipoprotein (LDL) from the bloodstream. Nicotinic acid also has a unique effect on raising high-density lipoprotein (HDL) cholesterol. In contrast to statins and fibric acid derivatives, nicotinic acid does not have a significant risk of myositis as a side effect.

**Why Each Wrong Option is Incorrect**
**Option A:** Fibric acid derivatives, such as gemfibrozil and fenofibrate, are effective in lowering triglycerides and raising HDL cholesterol but have a risk of myositis, particularly when used in combination with statins.
**Option C:** Atorvastatin is a statin that inhibits HMG-CoA reductase, leading to decreased cholesterol synthesis in the liver. However, it carries a risk of myositis, especially when used in combination with other lipid-lowering agents.
**Option D:** Simvastatin is another statin that has a similar mechanism of action to atorvastatin but also carries a risk of myositis, particularly when used in combination with other lipid-lowering agents.

**Clinical Pearl / High-Yield Fact**
When choosing a lipid-lowering agent, it is essential to consider the patient's overall lipid profile and the potential side effects of each treatment option. Nicotinic acid can be an effective choice for patients with hypertriglyceridemia and low HDL cholesterol, as it has a unique mechanism of action that does not involve the inhibition of HMG-CoA reductase or the breakdown of adipose tissue triglycerides.

**✓ Correct Answer: B. Nicotinic acid**