An antibody is:

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(A) An antibody is a specialized protein molecule,also known as an immunoglobulin $(Ig)$,that is produced by $B$-lymphocytes (plasma cells) in respons

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a molecule that specifically interacts with an antigen

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(A) An antibody is a specialized protein molecule,also known as an immunoglobulin $(Ig)$,that is produced by $B$-lymphocytes (plasma cells) in response to an antigen.Its primary function is to specifically recognize,bind to,and neutralize or mark the antigen for destruction by the immune system.$T$-lymphocytes are involved in cell-mediated immunity but do not produce antibodies.Natural killer cells are part of the innate immune system and do not produce antibodies.Therefore,the correct statement is that an antibody is a molecule that specifically interacts with an antigen.

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