Select the incorrect statement from the following.

Options

A. Most of the parasites are also pathogens.
B. Intestinal perforation and death may occur in severe cases of typhoid fever.
C. Plague is cause by virus.
D. Rhinoviruses causes common cold.

Answer

To solve the question of selecting the incorrect statement from the provided options, we will analyze each statement one by one.

### Step-by-Step Solution:

1. **Statement 1: Most of the parasites are also pathogens.**
- Explanation: Parasites are organisms that live on or in a host and get their food at the expense of their host. Many parasites, such as certain protozoa, bacteria, and viruses, can cause diseases in their hosts. Therefore, this statement is correct.

2. **Statement 2: Intestinal perforation and death may occur in severe cases of typhoid fever.**
- Explanation: Typhoid fever is caused by the bacterium Salmonella typhi. In severe cases, it can lead to complications such as intestinal perforation, which can be life-threatening. Thus, this statement is also correct.

3. **Statement 3: Plague is caused by a virus.**
- Explanation: Plague is caused by the bacterium Yersinia pestis, not a virus. This statement is incorrect, as it misidentifies the causative agent of plague.

4. **Statement 4: Rhinoviruses cause the common cold.**
- Explanation: Rhinoviruses are indeed one of the major causes of the common cold, leading to symptoms such as sneezing and a runny nose. This statement is correct.

### Conclusion:
The incorrect statement among the provided options is **Statement 3: Plague is caused by a virus.**

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