The immune response is a cascade that reacts to a:

Question

Quizplus · Accepted Answer

The immune response is an adaptive response by the body to a pathogen, which is a microorganism that can cause disease such as bacteria, viruses, fungi, and parasites. The immune system recognizes and responds to specific antigens on the surface of these pathogens. Therefore, choice A is the best answer. Although toxins, bacteria, and viruses can all be pathogens and trigger the immune response, the most comprehensive term that covers all these possibilities is pathogen.

The Immune Response Is a Cascade That Reacts to A