Personally, I would say it is C but I'm not 100% sure
Go to this link it shows you everything. http://npic.orst.edu/health/child.html
With doctors and nurses as well as patients (or parents of the patients) who understand the medical terminology you are using
<span>The mosquito played a role of the vector for the disease. Mosquito carried the organism, as a mode of transmission of the disease, which landed onto Jane, and caused infection in her body. The organism got transported by the help of the mosquito.</span>