The following lumphoid organ provides the site for the interaction of lymphocytes with the antigen

Options

A. Bone marrow
B. Thymus
C. Spleen
D. All of these

Answer

To solve the question regarding which lymphoid organ provides the site for the interaction of lymphocytes with antigens, we can follow these steps:

### Step 1: Understand Lymphoid Organs
Lymphoid organs are specialized tissues where lymphocytes, a type of white blood cell, are produced, matured, and activated. They are classified into two categories: primary lymphoid organs and secondary lymphoid organs.

### Step 2: Identify Primary and Secondary Lymphoid Organs
- **Primary Lymphoid Organs**: These are the sites where lymphocytes originate and mature. The primary lymphoid organs include:
- Bone Marrow
- Thymus

- **Secondary Lymphoid Organs**: These are the sites where lymphocytes interact with antigens. The secondary lymphoid organs include:
- Spleen
- Lymph Nodes
- Tonsils
- Appendix

### Step 3: Analyze the Options
Now, let's analyze the options given in the question:
- A. Bone Marrow: Primary lymphoid organ (site of origin, not interaction)
- B. Thymus: Primary lymphoid organ (site of maturation, not interaction)
- C. Spleen: Secondary lymphoid organ (site of interaction with antigens)
- D. All of these: Incorrect as only spleen is a secondary lymphoid organ.

### Step 4: Conclusion
Based on the analysis, the only organ that provides a site for the interaction of lymphocytes with antigens is the **Spleen**. Therefore, the correct answer is **C. Spleen**.

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