## **Core Concept**
Tay-Sachs disease is a genetic disorder caused by a deficiency of a specific enzyme that leads to the accumulation of GM2 ganglioside within neurons. This condition is characterized by progressive destruction of nerve cells in the brain and spinal cord. The enzyme involved is crucial for breaking down certain lipids.

## **Why the Correct Answer is Right**
The correct answer, Hexosaminidase A, is the enzyme deficient in Tay-Sachs disease. Hexosaminidase A is a lysosomal enzyme that breaks down GM2 ganglioside, a type of lipid that accumulates in neurons. Without sufficient Hexosaminidase A, GM2 ganglioside accumulates within lysosomes, leading to cellular dysfunction and death, particularly in the nervous system.

## **Why Each Wrong Option is Incorrect**
- **Option A:** This option is incorrect because it does not specify the correct enzyme related to Tay-Sachs disease.
- **Option B:** This option is incorrect as it does not accurately represent the enzyme deficiency causing Tay-Sachs disease.
- **Option C:** This option is incorrect because it refers to another enzyme, Glucocerebrosidase, which is related to Gaucher's disease, not Tay-Sachs disease.

## **Clinical Pearl / High-Yield Fact**
A key clinical pearl is that Tay-Sachs disease is more common in individuals of Ashkenazi Jewish descent. The disease leads to severe neurological deterioration and death, usually by the age of 4. Carrier screening is available and recommended for individuals of high-risk ethnic backgrounds.

## **Correct Answer:** . Hexosaminidase A