Prions include:

Correct option is D

Ans (d)
Sol. Only DNA: Prions are not composed of DNA. They are misfolded proteins that can cause diseases by triggering other proteins to misfold.
DNA and RNA: Prions do not contain any nucleic acids like DNA or RNA. They are distinct from viruses, which have genetic material (DNA or RNA).
Only RNA: Prions do not consist of RNA either. They are purely protein-based infectious agents.
Proteins: Prions are abnormal, misfolded proteins that can induce other normally folded proteins to adopt the misfolded form, leading to diseases like mad cow disease and Creutzfeldt-Jakob disease.