Antibiotics play no role in viral infection however they are helpful in treating bacterial infections. Thus, the correct option is C.
Viral infections include infections such as common cold, flu, most coughs and bronchitis, chickenpox and HIV/AIDS. It can be difficult to know what causes these infections, because the viral and bacterial infections can cause similar symptoms however the pathogen is different.
Taking vitamins has been found to be effective in viral infections. Vaccination is also an effective prevention against viral infections and so are the drugs which inhibit transcription. However, antibiotics do not work on viruses, such as those that cause colds, flu, or HIV/AIDS.
Therefore, the correct option is C.
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