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. **Understanding the Terms**:
- **Pathogens**: These are organisms that cause disease in humans or animals. They can be bacteria, viruses, or parasites.
- **Parasites**: These are organisms that live on or in a host and derive nutrients at the host's expense, often causing harm.

2. **Evaluating Statement A**:
- **Statement**: "Most of the parasites are also pathogens."
- **Analysis**: This statement is correct. Many parasites cause diseases in their hosts, thus they are considered pathogens.

3. **Evaluating Statement B**:
- **Statement**: "Intestinal perforation and death may occur in severe cases of typhoid."
- **Analysis**: This statement is also correct. Typhoid fever, caused by the bacterium Salmonella typhi, can lead to severe complications, including intestinal perforation and death if untreated.

4. **Evaluating Statement C**:
- **Statement**: "Plague is caused by virus."
- **Analysis**: This statement is incorrect. The plague is caused by the bacterium Yersinia pestis, not a virus. Therefore, this is the incorrect statement we are looking for.

5. **Evaluating Statement D**:
- **Statement**: "Rhinovirus causes common cold."
- **Analysis**: This statement is correct. Rhinoviruses are indeed one of the main causes of the common cold.

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