Grey matter includes:

Options

A. Concentrated axon
B. Unmyelinated axon
C. Myelinated axon
D. A & B both

Answer

To answer the question "Grey matter includes:", we need to analyze the components of grey matter in the central nervous system. Here’s a step-by-step breakdown:

### Step-by-Step Solution:

1. **Understanding Grey Matter**: Grey matter is a major component of the central nervous system, primarily found in the brain and spinal cord. It consists mainly of neuronal cell bodies, dendrites, and unmyelinated axons.

2. **Evaluating the Options**:
- **Option 1: Concentrated Axon**: This refers to a collection of axons, which can be unmyelinated. This option is correct as grey matter contains concentrated axons.
- **Option 2: Unmyelinated Axon**: Unmyelinated axons are indeed a significant part of grey matter. This option is also correct.
- **Option 3: Myelinated Axon**: Myelinated axons are found in white matter, not grey matter. Therefore, this option is incorrect.
- **Option 4: A and B**: Since both concentrated axons and unmyelinated axons are included in grey matter, this option is correct.

3. **Conclusion**: The correct answer is option 4, which states that grey matter includes both concentrated axons and unmyelinated axons.

### Final Answer:
Grey matter includes concentrated axons and unmyelinated axons (Option 4: A and B).