Dum-dum fever is caused by

Options

A. Leishmania donovani
B. Glossina palpalis
C. Giardia intestinalis
D. Trypanosoma gambiens

Answer

### Step-by-Step Solution:

1. **Identify the Question**: The question asks about the causative agent of Dum-dum fever, which is also known as Kala Azar.

2. **Understand the Options**: The options provided are:
- a. Leishmania Donovani
- b. Glossina Palpalis
- c. Giardia Intestinalis
- d. Trypanosoma Gambiense

3. **Analyze Each Option**:
- **Leishmania Donovani**: This is a protozoan parasite known to cause Kala Azar (Dum-dum fever).
- **Glossina Palpalis**: This is a species of tsetse fly that transmits Trypanosomiasis (sleeping sickness), not Dum-dum fever.
- **Giardia Intestinalis**: This parasite causes giardiasis, which is unrelated to Dum-dum fever.
- **Trypanosoma Gambiense**: This is another protozoan that causes African sleeping sickness, not Dum-dum fever.

4. **Conclusion**: Based on the analysis, the correct answer is **a. Leishmania Donovani**, as it is the causative agent of Dum-dum fever (Kala Azar).

### Final Answer:
Dum-dum fever is caused by **Leishmania Donovani**.

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