Identify the WRONGLY matched pair

Options

A. Typhoid -Widal test
B. Plague - Viral disease
C. Malignant malaria - Plasmodium falciparum
D. Common cold - Rhinovirus

Answer

To identify the wrongly matched pair from the given options, we will analyze each pair one by one.

1. **Typhoid and Vidal test**:
- Typhoid is caused by the bacterium *Salmonella typhi*.
- The Vidal test is a serological test used to confirm the presence of *Salmonella typhi* in the body.
- Therefore, this pair is correctly matched.

2. **Plague and viral disease**:
- Plague is caused by the bacterium *Yersinia pestis*.
- It is not a viral disease; hence, this pair is incorrectly matched.
- This is the wrongly matched pair.

3. **Malignant Malaria and Plasmodium falciparum**:
- Malignant Malaria is indeed caused by the protozoan *Plasmodium falciparum*.
- This pair is correctly matched.

4. **Common cold and viral disease**:
- The common cold is caused by viruses, primarily the rhinovirus.
- Therefore, this pair is also correctly matched.

After analyzing all the pairs, we conclude that the wrongly matched pair is **Plague and viral disease**.

### Summary of the Solution:
- The wrongly matched pair is **Plague and viral disease** because plague is caused by a bacterium (*Yersinia pestis*), not a virus.