Question

What is a vaccination? It's not A

a) an injection of a chemical formula that forms a shield around bacteria
b) an injection of a full-strength form of bacteria that causes a disease
c) an injection of weakened bacteria that creates immunity to a disease
d) an injection of blood taken from another person who has no bacteria​

Answer 1

c) an injection of weakened bacteria that creates immunity to a disease

Answer 2

An injection of weakened bacteria that creates immunity to a disease.

Option c is the correct answer