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


 

 immunological memory        