An example of a viral disease of farm animals is

This question is asking about an example of a viral disease that affects farm animals.

The correct option is Option D: newcattle disease.

Viral diseases are caused by viruses, which are tiny infectious agents that can only replicate inside the cells of living organisms. They can affect both humans and animals, including farm animals. Viral diseases can spread from one animal to another through direct contact, through contaminated food or water, or through vectors like mosquitoes or ticks.

In this case, newcattle disease is an example of a viral disease that affects farm animals. However, it is important to note that "newcattle disease" is not a specific viral disease name that is commonly used. It is possible that this option may be incorrect or there may be a typo in the question.

To learn more about viral diseases of farm animals, please refer to your Agricultural Science textbook.