Which of the following is the bacterial disease in humans ?

Options

A. Pneumonia can be transmitted to a healthy person by inhaling the droplets released by an infected person and also by sharing utensils.
B. Malaria
C. Plague
D. Both (a) and (c )

Explanation

To determine which of the following is a bacterial disease in humans, we can analyze each option provided:

1. **Pneumonia**:
- Pneumonia is a lung disease characterized by symptoms such as high fever and chills.
- It can be caused by both bacteria and viruses.
- The specific bacterium that causes bacterial pneumonia is *Streptococcus pneumoniae*.
- Therefore, pneumonia can be classified as a bacterial disease.

2. **Malaria**:
- Malaria is a disease caused by the bite of the female Anopheles mosquito.
- It is caused by a protozoan parasite, specifically from the genus *Plasmodium*.
- Since malaria is caused by a protozoan and not bacteria, it is not a bacterial disease.

3. **Plague**:
- Plague is a disease that is transmitted by rodent fleas.
- It is caused by the bacterium *Yersinia pestis*, which is a gram-negative bacterium.
- Therefore, plague is classified as a bacterial disease.

Based on the analysis:
- Pneumonia is a bacterial disease.
- Malaria is not a bacterial disease (it is protozoan).
- Plague is a bacterial disease.

Thus, the correct answer is **both A (Pneumonia) and C (Plague)**.

Final Answer: **Both A and C (Pneumonia and Plague)**.