Which of the following animal diseases is caused by a virus?

Options

A. Anthrax
B. Rinderpest
C. Tick fever
D. Coccidiosis

Answer

**Step-by-Step Solution:**

1. **Identify the Diseases Listed**: The question provides a list of animal diseases. We need to analyze each one to determine if it is caused by a virus.

2. **Analyze Anthrax**: The first disease mentioned is anthrax. Research shows that anthrax is caused by the bacterium *Bacillus anthracis*. Therefore, anthrax is not a viral disease.

3. **Analyze Rinderpest**: The second disease is rinderpest, also known as cattle plague. It is caused by the rinderpest virus. Hence, rinderpest is a viral disease.

4. **Analyze Tick Fever**: The third disease is tick fever, which is also known as Rocky Mountain spotted fever. This disease is caused by an organism known as *Rickettsia*, which is a type of bacteria. Therefore, tick fever is not a viral disease.

5. **Analyze Coccidiosis**: The fourth disease is coccidiosis. This disease is caused by protozoan parasites, not viruses. Thus, coccidiosis is not a viral disease.

6. **Conclusion**: After analyzing all the diseases, the only disease that is caused by a virus is rinderpest.

**Final Answer**: Rinderpest (option 2) is the animal disease caused by a virus.

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