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B
Lipoprotein
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C
Lipid
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D
Nucleoprotein
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Solution
The correct option is D Protein An antibody, also known as an immunoglobulin is a large, Y-shaped protein which is produced mainly by plasma cells and it is used by the immune system to neutralize pathogens such as pathogenic bacteria and viruses. Antibodies are secreted by B lymphocytes of the adaptive immune system, mostly by differentiated B cells called plasma cells. Hence, chemically, an antibody is a protein.