**Core Concept**
The snowstorm appearance in ultrasound refers to a characteristic pattern of echogenic speckles and reverberation artifacts seen on imaging, typically associated with specific tissue or fluid characteristics. This phenomenon is often observed in pathologies where there is a mixture of solid and cystic components, leading to a chaotic and disorganized ultrasound appearance.

**Why the Correct Answer is Right**
The snowstorm appearance is classically seen in **hepatocellular carcinoma (HCC)**, where the irregular mixture of tumor cells and blood vessels creates a chaotic ultrasound pattern. This is due to the presence of **microvascular invasion** and **tumor necrosis**, which disrupts the normal liver architecture and leads to a characteristic "snowstorm" appearance on ultrasound. The combination of **reverberation artifacts** and **echogenic speckles** creates a confusing ultrasound image that can be challenging to interpret.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because while certain types of liver disease may exhibit a "mosaic" or "spotted" appearance on ultrasound, they do not typically produce a snowstorm pattern.
**Option B:** This option is incorrect because **fatty liver disease** often presents with a "bright liver" or "honeycomb" appearance on ultrasound, but not a snowstorm pattern.
**Option C:** This option is incorrect because **hepatitis** may cause a range of ultrasound findings, including increased echogenicity or a "bright liver" appearance, but not typically a snowstorm pattern.

**Clinical Pearl / High-Yield Fact**
The snowstorm appearance is a classic ultrasound finding in hepatocellular carcinoma, and its presence should prompt further investigation and consideration of malignancy.

**Correct Answer:** C. Hepatocellular carcinoma.