Which is not correct regarding B-lymphocytes?
A. Each B-lymphocyte responds to one particular antigen.
B. They must be activated by helper T-lymphocytes, which present antigens to them.
C. Memory B-lymphocytes may live for months or even years.
D. Activated B-lymphocytes transform into plasma cells, memory B-lymphocytes, or NK cells.
E. B-lymphocytes produce immunoglobulins.
Answer: D
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