What is an antibody?

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(C) An antibody,also known as an immunoglobulin $(Ig)$,is a large,$Y$-shaped protein produced by plasma cells (differentiated $B$-lymphocytes) of the

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$A$ molecule that specifically reacts against an antigen

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(C) An antibody,also known as an immunoglobulin $(Ig)$,is a large,$Y$-shaped protein produced by plasma cells (differentiated $B$-lymphocytes) of the immune system.Its primary function is to identify and neutralize foreign objects such as bacteria and viruses.Antibodies specifically recognize and bind to unique molecules called antigens present on the surface of pathogens,thereby triggering an immune response.

Column $I$ (Type of Immunity)	Column $II$ (Example)
$i$. Natural acquired active	$a$. $BCG$ Vaccine
$ii$. Artificial acquired active	$b$. Immunity against measles
$iii$. Natural acquired passive	$c$. Colostrum
$iv$. Artificial acquired passive	$d$. Injections against rabies

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