The correct option is
A Central nervous system
Rabies is a life-threatening condition that causes tens of thousands of deaths worldwide every year. It’s caused by a virus that attacks the central nervous system. The virus is transmitted to humans via bites and scratches from infected animals. The symptoms of rabies can present themselves just a few days after a bite, or they might take as long as 12 weeks. The common symptoms includes fever, headache, nausea and fear of water due to difficulty in swallowing, insomnia etc. Therefore, the correct answer is option A.