Final answer:
An immune response that is nonspecific is referred to as innate immunity. The innate immune response is immediate and not specific to any pathogen, unlike the highly specific adaptive immune response involving T cells and B cells.
Step-by-step explanation:
An immune response that is nonspecific is referred to as innate immunity, which is the correct answer to the given question. The innate immune response is immediate and includes both cellular and humoral components that work together to defend the body against pathogens in a general, non-specific manner. In contrast, the adaptive immune response is highly specific to particular pathogens and includes cell-mediated immunity, which involves T cells, and humoral immunity, which is controlled by B cells and antibodies. An important aspect of adaptive immunity is the development of memory cells, which provide long-term protection and a quicker response upon reexposure to the same pathogen.