The correct option is C DNA or RNA but not both
A virus is a microorganism that is smaller than a bacterium which cannot grow or reproduce apart from a living cell. A virus is made up of a core of genetic material which is surrounded by a protective coat called a capsid which is made up of protein. Viruses have either RNA or DNA as their genetic material but do not contains both. The nucleic acid may be single or double-stranded. So, the correct answer is 'DNA or RNA but not both'.