Which of the following will be included under innate immunity?

Options

A. Mucus membrane
B. Interferons
C. Natural killer cells
D. All of these

Answer

To determine which of the following options is included under innate immunity, we will analyze each option provided in the question.

### Step-by-Step Solution:

1. **Understanding Innate Immunity**:
- Innate immunity is the natural defense mechanism that is present in our body from birth. It acts as the first line of defense against pathogens.

2. **Analyzing the Options**:
- **Option 1: Mucous Membrane**:
- Mucous membranes are part of the physical barrier that prevents the entry of pathogens into the body. They are indeed a component of innate immunity.
- **Option 2: Interferons**:
- Interferons are proteins produced by the body in response to viral infections. They play a role in signaling and activating the immune response, making them part of innate immunity.
- **Option 3: Natural Killer (NK) Cells**:
- NK cells are a type of lymphocyte that can kill virus-infected cells and tumor cells. They are also part of the innate immune system as they are present at birth and provide immediate defense.
- **Option 4: All of These**:
- Since all the above options (mucous membranes, interferons, and NK cells) are components of innate immunity, this option is correct.

3. **Conclusion**:
- The correct answer is **Option 4: All of These**. All the listed components are part of innate immunity.