Which of the following match is correct ?

Options

A.
B.
C.
D.

Explanation

To determine which of the matches is correct, we need to analyze each option provided in the question carefully.

### Step-by-Step Solution:

1. **Option A: Multi-lobed structure (3-5%) - Phagocytic function**
- The multi-lobed structure refers to neutrophils. Neutrophils are indeed phagocytic cells that respond to bacterial and fungal infections. However, the percentage given (3-5%) is not accurate for neutrophils, as they typically make up about 60-70% of white blood cells. Therefore, this option is **incorrect**.

2. **Option B: Bi-lobed or tri-lobed structure (0.5-1%) - Secretes histamine and serotonin**
- The bi-lobed or tri-lobed structure refers to basophils. Basophils are involved in allergic responses and secrete histamine and serotonin. The percentage given (0.5-1%) is accurate for basophils. Therefore, this option is **correct**.

3. **Option C: Bi-lobed structure (30-40%) - Defense against parasites**
- The bi-lobed structure refers to eosinophils. Eosinophils are indeed involved in defense against parasites and allergic reactions. However, the percentage given (30-40%) is incorrect, as eosinophils typically make up about 1-4% of white blood cells. Therefore, this option is **incorrect**.

4. **Option D: Large circular structure (30-40%) - Allergic reaction**
- The large circular structure refers to monocytes. Monocytes are involved in phagocytosis but are not primarily responsible for allergic reactions. The percentage given (30-40%) is also incorrect, as monocytes typically make up about 2-8% of white blood cells. Therefore, this option is **incorrect**.

### Conclusion:
The only correct match is **Option B**, which states that basophils (bi-lobed or tri-lobed structure) secrete histamine and serotonin and constitute 0.5-1% of white blood cells.

### Final Answer:
**Option B is the correct match.**

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