B-lymphocytes are categorized as part of the adaptive branch of the immune system for all of the following reason but one. Which of the following is not one of the reasons B-lymphocytes are considered part of the adaptive immunity?

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Examining the statement about B-lymphocytes and their classification in the immune system requires separating innate and adaptive features. 
Option A: 'They produce memory cells when activated.' This is a hallmark of adaptive immunity, since memory B cells enable quicker and stronger responses upon re-exposure to the same antigen. 
Option B: 'They are a first line of defense that can begin killing pathogens immediately.' This describes innate immune characteristics, not adaptive ones; B cells are not the rapid, nonspecific first responders capable of immediate killing. Their activation typically involves a B cell receptor recognizing its specific antigen and often requires T cell help, with responses that develop over days. 
Option C: 'Their receptors will bind to only one antigen.' The high specificity and the use of a single, unique antigen-binding receptor is a defining feature of adaptive immunity and B cells in particular. 
Option D: 'They require costimulation from an activated T-helper cell.' This costimulatory requirement is characteristic of many B cell activation pathways in the adaptive immune response, particularly thymus-dependent activation. 
Option E: 'Their action involves production of antibodies.' Antibody production is the classic effector mechanism of B cells within adaptive immunity. 
Putting these together, option B is the exception: it attributes a first-line, immediate defense role to B cells, which is a property of the innate immune system rather than adaptive immunity.

B-lymphocytes are categorized as part of the adaptive branch of the immune system for all of the following reason but one. Which of the following is not one of the reasons B-lymphocytes are considered part of the adaptive immunity?

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