Natural killer cells (NK cells) provide which immunity ?

Options

A. Cell mediated immunity
B. Innate immunity
C. Acquired immunity
D. Specific immunity

Answer

**Step-by-Step Text Solution:**

1. **Understanding Natural Killer Cells (NK Cells)**:
- Natural Killer (NK) cells are a type of lymphocyte (a white blood cell) that play a crucial role in the immune response. They are part of the body's defense mechanism against tumors and virally infected cells.

2. **Identifying the Type of Immunity**:
- Immunity can be broadly classified into two categories: innate immunity and adaptive immunity. Innate immunity is the first line of defense and is non-specific, while adaptive immunity is specific and involves memory cells.

3. **Role of NK Cells in Immunity**:
- NK cells are primarily involved in innate immunity. They act quickly to identify and destroy infected or cancerous cells without the need for prior sensitization to specific antigens.

4. **Conclusion**:
- Therefore, Natural Killer cells provide innate immunity.

**Final Answer**: Natural Killer cells (NK cells) provide innate immunity.

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