**Core Concept**
Fatty liver disease, also known as steatosis, is a condition characterized by an accumulation of excess fat in liver cells. This condition can be caused by various factors, including metabolic disorders, excessive alcohol consumption, and certain medications.

**Why the Correct Answer is Right**
The correct answer is **B. Non-Alcoholic Fatty Liver Disease (NAFLD)**. NAFLD is a condition in which excess fat accumulates in the liver of people who drink little or no alcohol. This condition is often associated with insulin resistance, obesity, and metabolic syndrome. The accumulation of fat in liver cells leads to cellular damage and inflammation, which can progress to more severe liver conditions such as non-alcoholic steatohepatitis (NASH) and cirrhosis.

**Why Each Wrong Option is Incorrect**
**Option A:** Alcoholic liver disease is a condition caused by excessive alcohol consumption, which can lead to inflammation and scarring of the liver, but it does not characteristically cause fatty change in the liver.

**Option C:** Wilson's disease is a genetic disorder that affects the metabolism of copper, leading to its accumulation in the liver, brain, and other organs. While it can cause liver damage, it is not characterized by fatty change.

**Clinical Pearl / High-Yield Fact**
NAFLD is a common condition, affecting up to 25% of the general population, and is often associated with other metabolic disorders such as type 2 diabetes and dyslipidemia.

**Correct Answer: B. Non-Alcoholic Fatty Liver Disease (NAFLD)**