The correct answer is (a) Yellow Fever.
Yellow fever is an acute viral hemorrhagic fever of the Flaviviridae family. The virus is transmitted to humans primarily through the bite of an infected Aedes aegypti mosquito. Symptoms of yellow fever can include fever, headache, muscle pain, nausea, vomiting, jaundice, and bleeding. In severe cases, yellow fever can lead to death.
Polio is an acute viral illness that mainly affects children. The virus enters the body through the mouth and multiplies in the intestines. It can then spread to the bloodstream and nervous system. Polio can cause paralysis, which can be permanent.
Influenza is a contagious respiratory illness caused by influenza viruses that infect the nose, throat, and sometimes the lungs. It can cause mild to severe illness, and at times can lead to death. The best way to prevent the flu is by getting a flu vaccine each year.
Syphilis is a sexually transmitted infection (STI) caused by the bacterium Treponema pallidum. Syphilis can cause serious health problems if it is not treated. The best way to prevent syphilis is to use condoms during sexual activity.
I hope this helps! Let me know if you have any other questions.