Allergy is due to release of histamine and serotonin from

Options

A. lymphocytes
B. Mast cells
C. Monocytes
D. Neutrophils

Answer

To solve the question "Allergy is due to release of histamine and serotonin from," we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Question**: The question is asking about the source of histamine and serotonin during an allergic reaction.

2. **Identify Key Terms**: The key terms here are "allergy," "histamine," and "serotonin." We need to focus on which cells release these substances during an allergic response.

3. **Review the Options**: The options provided are:
- A) Lymphocyte
- B) Mast cells
- C) Monocytes
- D) Neutrophil

4. **Recall Biological Functions**:
- **Lymphocytes** are primarily involved in the immune response and do not release histamine or serotonin.
- **Mast cells** are known to release histamine and serotonin, especially during allergic reactions and inflammation.
- **Monocytes** are a type of white blood cell that can differentiate into macrophages and do not primarily release histamine or serotonin.
- **Neutrophils** are also a type of white blood cell that primarily responds to infections and do not release these substances.

5. **Conclude the Correct Answer**: Since mast cells are specifically known for releasing histamine and serotonin during allergic reactions, the correct answer is **B) Mast cells**.

### Final Answer:
Allergy is due to the release of histamine and serotonin from **mast cells**.

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