**Question:** What is accumulated in Gaucher's disease:

A. Glucosylceramides
B. Glycosaminoglycans
C. Cholesterol
D. Lipids

**Core Concept:**
Gaucher's disease is a lysosomal storage disorder caused by deficiency of glucocerebrosidase enzyme, which leads to the accumulation of lipids, specifically glucosylceramides and glucocerebrosides, within the macrophages.

**Why the Correct Answer is Right:**
In Gaucher's disease, the deficiency of glucocerebrosidase enzyme results in the accumulation of glucosylceramides and glucocerebrosides within the macrophages. These accumulated lipids cause the enlargement of macrophages, particularly in the liver, spleen, and bone marrow, leading to the characteristic manifestations of the disease.

**Why Each Wrong Option is Incorrect:**
A. Glucosylceramides and glucocerebrosides are the lipids specifically accumulated in Gaucher's disease, not cholesterol (option C). Cholesterol is not a primary component of the lysosomal storage disorder.
B. Gaucher's disease is due to the accumulation of glucosylceramides and glucocerebrosides, not glycosaminoglycans (option B). Glycosaminoglycans are not the primary component involved in Gaucher's disease pathogenesis.
D. While lipids are involved in Gaucher's disease, the correct answer focuses on glucosylceramides and glucocerebrosides (option D). These specific lipids are the primary substances accumulated in Gaucher's disease.

**Clinical Pearl:**
Gaucher's disease is an example of a lysosomal storage disorder caused by the deficiency of lysosomal enzymes. Accumulation of glucosylceramides and glucocerebrosides leads to the characteristic clinical manifestations of the disease. Early diagnosis and treatment can lead to improved outcomes and reduced complications.