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Which of the following antibody-secreting cells is triggered to proliferate upon vaccination?

A B-lymphocytes

The cells secrete antibodies. It can’t be erythrocytes – red blood cells just carry oxygen and don’t make antibodies. T-cells are for “cellmediated immunity”, so they don’t do antibodies either, and leukocyte just means “white blood cell”, so the correct answer must be “B-lymphocytes.”