Given the question: Fact 1: Active immunity results when an immune response to a pathogen produces memory cells. Fact 2: Memory cells are the basis of immunological memory. Given the two facts above, answer the question "Active immunity results when an immune response to a pathogen produces the basis of what?" with the following options: - immunological memory - failed memories - resistance - broken memory - major threat to health - resistance activities - Leptospirosis - sad memories
The answer is:
immunological memory