Select the incorrect match.

Options

A. Disease - Malaria , Causative organisms - A protozoan , Insect - Anopheles
B. Disease - Chikungunya, Causative organism - A bacteria, Insect - Culex
C. Disease - Filariasis , Causative organism - An annelid , Insect - Culex
D. Disease - Dengue, Causative organism - A virus, Insect - Aedes

Answer

To solve the question of identifying the incorrect match between a disease, its causative organism, and the insect that transmits it, we will analyze each option provided.

### Step-by-Step Solution:

1. **Identify the first option: Malaria**
- **Causative Organism:** Plasmodium (Protozoan)
- **Insect Vector:** Anopheles mosquito
- **Evaluation:** This is a correct match. Malaria is caused by the Plasmodium species, and it is transmitted by the Anopheles mosquito.

2. **Identify the second option: Chikungunya**
- **Causative Organism:** Bacteria (as per the option)
- **Insect Vector:** Culex mosquito (as per the option)
- **Evaluation:** This is an incorrect match. Chikungunya is caused by a virus, not bacteria, and it is primarily transmitted by the Aedes mosquito, not Culex.

3. **Identify the third option: Filariasis**
- **Causative Organism:** Filarial worm (Nematode)
- **Insect Vector:** Culex mosquito
- **Evaluation:** This is a correct match. Filariasis is caused by filarial worms and is transmitted by Culex mosquitoes.

4. **Identify the fourth option: Dengue**
- **Causative Organism:** Virus
- **Insect Vector:** Aedes mosquito
- **Evaluation:** This is a correct match. Dengue fever is caused by the dengue virus and is transmitted by Aedes mosquitoes.

### Conclusion:
The incorrect match is found in the second option regarding Chikungunya, where it states that the causative organism is bacteria and the vector is Culex mosquito. The correct causative agent is a virus, and the correct vector is Aedes mosquito.

### Final Answer:
**The incorrect match is option B: Chikungunya - Bacteria - Culex mosquito.**

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