Final answer:
B lymphocytes, or B cells, are primarily responsible for producing antibodies in the immune response.
Step-by-step explanation:
B lymphocytes, or B cells, are primarily responsible for producing antibodies in the immune response. Antibodies are large proteins that bind to antigens, which are pathogen-associated molecules. Once activated, B cells differentiate into plasma cells that secrete soluble antibodies to neutralize and eliminate antigens.