Answer:
The correct answer is - antibodies.
Explanation:
Vaccines are the biological substance or the preparation that helps in building the active acquired immunity from a particular disease. Vaccines are basically weakened or dead infectious agents or particles that induce or active the B cells to produce antibodies and memory cells.
These antibodies are formed by the vaccines by triggering the production of B cells. This process of injecting vaccines is known as vaccination.
Thus, the correct answer is - antibodies.
