PATHOLOGY

Detailed explanation-1: -There are two main mechanisms of immunity within the adaptive immune system – humoral and cellular. Humoral immunity is also called antibody-mediated immunity. With assistance from helper T cells, B cells will differentiate into plasma B cells that can produce antibodies against a specific antigen.

Detailed explanation-2: -Cell-mediated immunity, unlike humoral immunity, does not rely on antibodies to perform adaptive immunological activities. Mature T cells, macrophages, and the production of cytokines in response to an antigen are the main drivers of cell-mediated immunity.

Detailed explanation-3: -B-lymphocytes form army of proteins called antibodies in response to pathogen in blood and are stimulated by antigen and T-helper cells. Therefore, B-lymphocytes provide humoral mediated immunity. T-lymphocytes provide cell mediated immunity. So, the correct option is ‘B-lymphocytes’.