Gamma immunoglobulins are synthesized in

Options

A. liver
B. bone marrow
C. kidney
D. lymphoid tissue

Answer

### Step-by-Step Solution:

1. **Understanding Gamma Immunoglobulins**: Gamma immunoglobulins, also known as immunoglobulin G (IgG), are a class of antibodies that play a crucial role in the immune response.

2. **Identifying the Site of Synthesis**: Gamma immunoglobulins are synthesized primarily in the lymphoid tissues. These tissues include lymph nodes and peripheral tissues where B lymphocytes are present.

3. **Role of B Lymphocytes**: The synthesis of gamma immunoglobulins is specifically carried out by B lymphocytes. These cells are responsible for producing antibodies in response to antigens.

4. **Other Options Analysis**:
- **Liver**: While the liver is involved in various functions, it is not the primary site for gamma immunoglobulin synthesis.
- **Bone Marrow**: Although bone marrow is crucial for the production of blood cells, including B lymphocytes, the actual synthesis of gamma immunoglobulins occurs in lymphoid tissues.
- **Kidney**: The kidneys are primarily involved in filtering blood and do not play a role in the synthesis of gamma immunoglobulins.

5. **Conclusion**: Based on the analysis, the correct answer to the question "Gamma immunoglobulins are synthesized in" is **lymphoid tissues**.