The opposite to innate immunity is:

Options

A. Passive immunity
B. T-cells immunity
C. Phagocytosis
D. Acquired immunity

Answer

To solve the question "The opposite to innate immunity is:", we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Concept of Innate Immunity**:
- Innate immunity is the body's first line of defense against pathogens. It includes physical barriers (like skin), chemical barriers (like stomach acid), and immune responses that are non-specific and immediate.

2. **Identify the Two Main Types of Immunity**:
- The immune system is primarily divided into two categories:
- **Innate Immunity**: Non-specific, immediate response.
- **Acquired Immunity**: Specific response that develops over time and involves memory.

3. **Analyze the Options Provided**:
- **Option 1: Passive Immunity**: Refers to the transfer of antibodies from one individual to another. It is a type of acquired immunity but not the direct opposite of innate immunity.
- **Option 2: T Cell Immunity**: Refers to the immune response mediated by T cells, which is part of acquired immunity, but not the opposite of innate immunity.
- **Option 3: Phagocytosis**: This is a process carried out by certain cells (phagocytes) to engulf and digest pathogens. It is a mechanism of innate immunity, not the opposite.
- **Option 4: Acquired Immunity**: This is the specific immune response that develops after exposure to pathogens and involves memory cells (B cells and T cells).

4. **Determine the Correct Answer**:
- After evaluating all options, the most suitable answer that represents the opposite of innate immunity is **Acquired Immunity**.

5. **Final Answer**:
- The opposite to innate immunity is **Acquired Immunity**.