The correct option is A Mosquito
Yellow fever is an acute viral fever caused by a flavivirus. It is transmitted by the bite of mosquitoes, usually the Aedes aegypti mosquito. It is characterized by a headache, chills, loss of appetite, nausea etc. In severe cases, yellow fever causes a high fever, bleeding into the skin and the death of cells in the liver and kidneys. Liver damage results in severe jaundice i.e., yellowing of the skin; hence the name "yellow fever". Thus, the correct answer is option A.