Which pathogen is known as a non-cellular entity with either DNA or RNA?

Viruses are indeed classified as non-cellular entities that contain either DNA or RNA as their genetic material. Unlike bacteria, fungi, and parasites, which are composed of cells and can carry out metabolic processes independently, viruses lack the cellular structure necessary for independent life. Instead, they require a host cell to replicate and propagate. This distinctive characteristic of having either DNA or RNA, but not both, allows viruses to infect host organisms and hijack their cellular machinery for reproduction. This makes viruses unique among the pathogens listed, further confirming their classification as non-cellular infectious agents.