Discussion
The protein, produced by B cells that binds to a specific antigen is
Answer: D
Correct answer: antibody
An antibody (immunoglobulin) is the Y-shaped protein secreted by plasma cells, with two binding sites shaped to fit one particular antigen. Binding neutralises the antigen, marks it for phagocytosis, or triggers complement. A phagocyte and a leucocyte are cells; a vaccine is a preparation that provokes antibody rather than being one.
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