Which of the following is a mismathced pair of protozoan group and its example?

Options

A. Amoeboid protozoans - Entamoeba histolytica
B. Flagellated protozoan -Giardia intestinalis
C. Ciliated protozoan - Paramecium caudatum
D. Sporozoan - Leishmania donovani

Explanation

To determine which of the following is a mismatched pair of protozoan group and its example, we will analyze each option provided in the question.

### Step-by-Step Solution:

1. **Identify the Protozoan Groups and Their Examples**:
- **Option A**: Amoeboid protozoan - *Entamoeba histolytica*
- **Option B**: Flagellated protozoan - *Giardia intestinalis*
- **Option C**: Ciliated protozoan - *Paramecium caudatum*
- **Option D**: Sporozoan - *Leishmania donovani*

2. **Evaluate Each Option**:
- **Option A**: *Entamoeba histolytica* is indeed an amoeboid protozoan and causes amoebiasis. This is a correct match.
- **Option B**: *Giardia intestinalis* is a flagellated protozoan that causes giardiasis. This is also a correct match.
- **Option C**: *Paramecium caudatum* is a ciliated protozoan, which is a correct match as well.
- **Option D**: *Leishmania donovani* is an intracellular parasite that belongs to the genus Leishmania, which is classified under flagellated protozoans (kinetoplastids), not sporozoans. This is a mismatched pair.

3. **Conclusion**: The mismatched pair is **Option D**: Sporozoan - *Leishmania donovani*.

### Final Answer:
The mismatched pair of protozoan group and its example is **Option D: Sporozoan - *Leishmania donovani***.

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