**Core Concept**
The question is testing the student's knowledge of the sources of cholesterol in the human body. Cholesterol is an essential component of cell membranes and a precursor for the synthesis of steroid hormones and bile acids. It is obtained from both dietary sources and endogenous synthesis.

**Why the Correct Answer is Right**
The correct answer is **B. Egg yolk**. Egg yolk is a rich source of cholesterol, with approximately 200 milligrams per large egg. The cholesterol in egg yolks is predominantly present in the form of phospholipids and triglycerides. The liver plays a crucial role in regulating cholesterol levels in the body by synthesizing and breaking down cholesterol. The enzyme HMG-CoA reductase is a key regulator of cholesterol synthesis in the liver.

**Why Each Wrong Option is Incorrect**
* **Option A:** This option is missing, please provide the actual options to evaluate them.
* **Option C:** This option is also missing, please provide the actual options to evaluate them.

**Clinical Pearl / High-Yield Fact**
It is essential to note that dietary cholesterol has a limited impact on blood cholesterol levels in most individuals. The majority of cholesterol in the body is synthesized endogenously by the liver. A high intake of dietary cholesterol can increase blood cholesterol levels in individuals with familial hypercholesterolemia, a genetic disorder characterized by elevated LDL cholesterol levels.

**Correct Answer: B. Egg yolk**