Answer: Acquired Active Immune Response System
Explanation:
Vaccines are substances that are prepared from the causative agent of a disease or its synthetic substitute, which is treated to mimic the actual antigen of the disease. This artificial antigen of the disease, thereby stimulates the production of antibodies that helps in fighting the disease and also provides immunity against the disease in the body.
A primary response system is stimulated in the presence of the vaccine, which acts as an antigen. In this way, an artificially acquired active immune response system is created naturally using vaccines.
