Answer:
protein
Step-by-step explanation:
Antibodies are primarily Y shaped proteins which are secreted by B lymphocytes (plasma cells specifically). Antibodies are also known as immunoglobulins and provide us immunity. Apart from protein, carbohydrate is also present in antibodies. Antibodies interact with antigens which can be a pathogen or any other foreign molecule. The interaction of antibody and antigen leads to antigen-antibody complex formation which further leads to either agglutination or precipitation reaction. Due to agglutination or precipitation reaction, the pathogen or foreign molecule is cleared from our body.
There are five types of antibodies (immunoglobulins) named as IgG, IgM, IgA, IgE and IgD.