Lymphoid tissue is found in

Options

A. thymus
B. tonsils
C. lymph nodes
D. all of these

Explanation

To answer the question "Lymphoid tissue is found in," we will analyze the options provided and determine where lymphoid tissue is located.

### Step-by-Step Solution:

1. **Understanding Lymphoid Tissue**:
- Lymphoid tissue is a type of tissue that plays a crucial role in the immune system. It is involved in the production and maturation of lymphocytes, which are essential for immune responses.

2. **Analyzing the Options**:
- **Thymus**: The thymus is an organ where T-lymphocytes mature. It is a primary lymphoid organ, and thus, it contains lymphoid tissue.
- **Tonsils**: Tonsils are part of the lymphatic system and are located at the back of the throat. They contain lymphoid tissue that helps in fighting infections.
- **Lymph Nodes**: Lymph nodes are small, bean-shaped structures that filter lymph fluid and contain lymphoid tissue, which is crucial for immune responses.

3. **Conclusion**:
- Since lymphoid tissue is found in the thymus, tonsils, and lymph nodes, the correct answer to the question is "all of these."

### Final Answer:
Lymphoid tissue is found in **all of these**: thymus, tonsils, and lymph nodes.

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