Question

A vaccine puts into the body weakened/dead pathogenic material, which by itself is incapable of causing disease. How does this help to protect the body in the case of infection by a live pathogen?
A) A vaccine causes the elimination of antibodies from blood thus protecting the body at the time of an infection.
B) A vaccine injects weakened/dead pathogenic material which fights the live pathogen at the time of an infection.
C) A vaccine causes the secretion of antigens which remain in blood and fight the pathogen at the time of an infection.
D) A vaccine causes the secretion of antibodies which remain in blood and fight the pathogen at the time of an infection.

Answer 1

I'm thinking it's either A or B.

Answer 2

not D?

Answer 3

Now that I think about it, that does seem right. e.e

Answer 4

Thank you :)