Q: What kind of diseases can be difficult to treat because they live inside the host's cells, making it hard to destroy them without killing host cells?


Read this paragraph and choose the correct option from the provided answers:

Viral diseases can be difficult to treat. They live inside the cells of their host, so it is hard to destroy them without killing host cells. Antibiotics also have no effect on viruses. Antiviral drugs are available, but only for a limited number of viruses.

 Choices:

- superfluous diseases

- nucleus diseases

- cancerous diseases

- viral diseases


A:
viral diseases