Charcoat-Leyden crystals are characteristic of

Options

A. Trichomonas hominis
B. Giardia intestinalis
C. Entamoeba histolytica
D. Entamoeba coli.

Answer

**Step-by-Step Solution:**

1. **Understanding Charcot-Leyden Crystals**: Charcot-Leyden crystals are formed from the breakdown of eosinophils, a type of white blood cell. They are typically associated with allergic reactions and parasitic infections.

2. **Identifying the Source**: These crystals are primarily composed of a protein called galectin, which is released by eosinophils during immune responses, particularly in the presence of certain parasites.

3. **Analyzing the Options**: The question provides four options of parasites:
- **Trichomonas hominis**
- **Giardia intestinalis**
- **Entamoeba histolytica**
- **Entamoeba coli**

4. **Evaluating Each Option**:
- **Trichomonas hominis**: This parasite is known to be associated with the formation of Charcot-Leyden crystals.
- **Giardia intestinalis**: This parasite does not typically cause the formation of these crystals.
- **Entamoeba histolytica**: This is another parasite that does not lead to the production of Charcot-Leyden crystals.
- **Entamoeba coli**: Similar to the previous two, this parasite is not associated with these crystals.

5. **Conclusion**: Based on the analysis, the correct answer is **Trichomonas hominis**, as it is the only option that is characteristic of the formation of Charcot-Leyden crystals.

**Final Answer**: Charcot-Leyden crystals are characteristic of **Trichomonas hominis**.

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