**Core Concept**
Wolman's disease is a rare genetic disorder caused by a deficiency of the enzyme lysosomal acid lipase (LAL), leading to the accumulation of lipids in various organs, including the liver, spleen, and adrenal glands. This accumulation results in hepatosplenomegaly, liver dysfunction, and adrenal calcification.

**Why the Correct Answer is Right**
Wolman's disease is characterized by the presence of adrenal calcification, which is a result of lipid accumulation in the adrenal glands. The disease also leads to hepatosplenomegaly, abdominal distension, and jaundice due to liver dysfunction. Additionally, anemia is a common feature of Wolman's disease, likely due to the accumulation of lipids in the bone marrow. The deficiency of LAL enzyme leads to the accumulation of lipids, which causes the clinical manifestations of the disease.

**Why Each Wrong Option is Incorrect**
**Option A:** Adrenal hemorrhage typically presents with acute abdominal pain and may not be associated with the full range of symptoms seen in Wolman's disease.
**Option B:** Pheochromocytoma is a tumor of the adrenal gland that is not associated with the systemic features of Wolman's disease, such as hepatosplenomegaly and anemia.
**Option D:** Addison's disease is an autoimmune disorder that affects the adrenal glands, leading to adrenal insufficiency, but it is not associated with the characteristic adrenal calcification seen in Wolman's disease.

**Clinical Pearl / High-Yield Fact**
Wolman's disease is a rare but important diagnosis to consider in children presenting with hepatosplenomegaly, abdominal distension, jaundice, anemia, and adrenal calcification. Early diagnosis and treatment are crucial to prevent progression of the disease.

**✓ Correct Answer: C. Wolman's disease**