Which class of immunoglobulin is the first to be produced in response to an infection?

When antigens are introduced in the body through vaccination antibodies are produced to fight off infection

Which one of the following viruses used to be responsible for highly infectious disease Smallpox ?

Which of the following is responsible for ‘Bird flu’?

Which one among these is related to the deficiency of potassium?

Which of the following human organ is affected by the consumption of aflatoxin food adulterant?