Specific antibodies are released into body fluids by

Options

A. B-cells
B. T cells
C. Memory cells
D. Plasma cells

Answer

To answer the question "Specific antibodies are released into body fluids by," we will analyze the given options step by step.

### Step-by-Step Solution:

1. **Understanding the Question**: The question asks which type of cells are responsible for the release of specific antibodies into body fluids.

2. **Analyzing the Options**:
- **Option A: B cells**: B cells, also known as B lymphocytes, are part of the immune system. However, they do not directly release antibodies. Instead, they differentiate into another type of cell that does.
- **Option B: T cells**: T cells, or T lymphocytes, are crucial for adaptive immunity but do not produce antibodies. Their main role is in cell-mediated immunity.
- **Option C: Memory cells**: Memory cells are a type of B cell that retains information about past infections. They help in providing a faster immune response upon re-exposure to the same antigen but do not produce antibodies themselves.
- **Option D: Plasma cells**: Plasma cells are differentiated B cells that actively produce and secrete antibodies into body fluids.

3. **Identifying the Correct Answer**: Since plasma cells are the cells that release specific antibodies into body fluids, the correct answer is **Option D: Plasma cells**.

4. **Final Answer**: Specific antibodies are released into body fluids by plasma cells.