The reason for the exit of nerve cells from the cell cycle once after forming is `:`

Options

A. Absence of nucleus
B. Absence of mitrochondria
C. Absence of centrosome
D. Absence of Golgi body

Answer

To solve the question regarding why nerve cells exit the cell cycle after forming, we will analyze each option provided and determine which one is the correct reason.

### Step-by-Step Solution:

1. **Understanding the Cell Cycle**:
- The cell cycle consists of phases that include growth (interphase) and division (mitotic phase). Cells typically go through these phases to grow and replicate.

2. **Analyzing the Options**:
- **Option A: Absence of Nucleus**:
- The nucleus is essential for cell function and contains the genetic material. Nerve cells do have nuclei, so this option is incorrect.

- **Option B: Absence of Mitochondria**:
- Mitochondria are known as the powerhouse of the cell and are responsible for energy production. While they are important for cellular metabolism, they do not play a direct role in the cell cycle. Hence, this option is also incorrect.

- **Option C: Absence of Centrosome**:
- The centrosome is crucial for cell division as it helps in the formation of the spindle apparatus during mitosis. Nerve cells lack centrosomes, which is significant because this absence prevents them from undergoing cell division. Therefore, this option is likely correct.

- **Option D: Absence of Golgi Body**:
- The Golgi body is involved in the packaging and transport of proteins but does not directly influence the cell cycle. Thus, this option is incorrect.

3. **Conclusion**:
- Based on the analysis, the correct answer is **Option C: Absence of Centrosome**. This absence is the primary reason nerve cells exit the cell cycle after formation, as they do not have the necessary structures to undergo division.