The correct option is C Virus
Rabies is a viral infection that mainly spreads through a bite from an infected animal. It is an RNA virus of the rhabdovirus family. Rabies causes inflammation of the brain in humans and other mammals. It enters the peripheral nervous system directly and migrates to the brain. Once inside the nervous system the virus produces acute inflammation of the brain then coma and death soon follows. So the correct answer is 'virus'.