Select the option which correctly describes the types of diseases with its examples mentioned below:

Options

A. Protozoan: Malaria , amoebiasis , cholera
B. Bacterial: Typhoid , kala-azar, leprosy
C. Viral : Dengue , chikungunya , covid
D. Helminthic : Ascariasis, elephantiasis , ring worm

Answer

To solve the question regarding the types of diseases and their examples, we need to analyze each option provided and determine if the examples correctly match the type of disease mentioned.

### Step-by-Step Solution:

1. **Identify the Types of Diseases**: We need to categorize diseases based on their causative agents, which can include protozoans, bacteria, viruses, fungi, and helminths (worms).

2. **Evaluate Each Option**:
- **Option 1: Protozoan Diseases**: The diseases listed are Malaria, Amoebiasis, and Cholera.
- **Malaria** is caused by the protozoan *Plasmodium*.
- **Amoebiasis** is caused by the protozoan *Entamoeba histolytica*.
- **Cholera** is caused by the bacterium *Vibrio cholerae*.
- **Conclusion**: This option is incorrect because Cholera is not a protozoan disease.

- **Option 2: Bacterial Diseases**: The diseases listed are Typhoid, Kalazar, and Laparossi.
- **Typhoid** is caused by the bacterium *Salmonella typhi*.
- **Kalazar** (Leishmaniasis) is caused by the protozoan *Leishmania*.
- **Laparossi** (Leprosy) is caused by the bacterium *Mycobacterium leprae*.
- **Conclusion**: This option is incorrect because Kalazar is not a bacterial disease.

- **Option 3: Viral Diseases**: The diseases listed are Dengue, Chikungunya, and Covid.
- **Dengue** is caused by the Dengue virus.
- **Chikungunya** is caused by the Chikungunya virus.
- **Covid** (COVID-19) is caused by the SARS-CoV-2 virus.
- **Conclusion**: This option is correct as all listed diseases are viral.

- **Option 4: Helminthic Diseases**: The diseases listed are Ascaris, Elephantiasis, and Ringworm.
- **Ascaris** is caused by the helminth (worm) *Ascaris lumbricoides*.
- **Elephantiasis** is caused by filarial worms (helminths).
- **Ringworm** is caused by a fungus (not a helminth).
- **Conclusion**: This option is incorrect because Ringworm is a fungal infection.

3. **Final Conclusion**: After evaluating all options, the only option that correctly describes the types of diseases with their examples is **Option 3** (Dengue, Chikungunya, and Covid).