Answer:
a RNA virus
Explanation:
Causative agents of diseases are also known as pathogens. Pathogens include bacteria, fungi, protozoas, microscopic algae, virus, etc.
Pathogens cause disease by penetrating and infecting susceptible organisms. In order to do this, they need their genomes.
The genomes of pathogens are in form of DNA, except for virus whose genome can also be in the form of RNA.
Hence, treatment with a DNA-degrading enzyme will neutralize all pathogens, except a RNA virus.
