Which of the following is a pair of bacterial diseases ?

Options

A. Typhoid and Pneumonia
B. Malaria and AIDS
C. Ringworm and AIDS
D. Common cold and Malaria

Answer

To solve the question "Which of the following is a pair of bacterial diseases?" we will analyze each option provided:

### Step-by-Step Solution:

1. **Analyze Option 1: Typhoid and Pneumonia**
- **Typhoid**: Caused by the bacterium *Salmonella typhi*. This is a bacterial disease.
- **Pneumonia**: Caused by the bacterium *Streptococcus pneumoniae*. This is also a bacterial disease.
- **Conclusion**: Both diseases in this option are bacterial. This option is correct.

2. **Analyze Option 2: Malaria and AIDS**
- **Malaria**: Caused by *Plasmodium* species (e.g., *Plasmodium vivax*). This is a protozoan disease, not bacterial.
- **AIDS**: Caused by the Human Immunodeficiency Virus (HIV). This is a viral disease.
- **Conclusion**: Neither of these diseases is bacterial. This option is incorrect.

3. **Analyze Option 3: Ringworm and AIDS**
- **Ringworm**: Caused by fungi (specifically *Tinea* species). This is a fungal infection, not bacterial.
- **AIDS**: As previously stated, this is caused by a virus (HIV).
- **Conclusion**: Neither of these diseases is bacterial. This option is incorrect.

4. **Analyze Option 4: Common Cold and Malaria**
- **Common Cold**: Caused by various viruses (e.g., rhinoviruses). This is a viral disease.
- **Malaria**: As stated, this is caused by *Plasmodium* species, a protozoan.
- **Conclusion**: Neither of these diseases is bacterial. This option is incorrect.

### Final Conclusion:
The only option that contains a pair of bacterial diseases is **Option 1: Typhoid and Pneumonia**.