Hepatitis B and Corona Virus
A virus is a submicroscopic infectious agent that replicates inside the living cells of an organism. Viruses infect all life forms, from animals and plants to microorganisms, including bacteria and archaea.
Coronavirus and influenza are two examples of a virus
it's a common sense question think with coll head now there is the options for you - a) it's a wrong question b)in his dream c) he is dead d)sleeping during the night time