An immune complex is an aggregate of which of the following?

antibody molecules

antigen molecules

antibody and antigen molecules

histamine molecules

Antigen and antibody molecule.

Explanation:

Antigen may be defined as the substance that are capable of generating an immune response. Antibodies are the substance that are generated to kill the antigen.

Immune complex is also known as antigen antibody complex. The immune complex is made up of the antigen and its specific antibody generated to kill that antigen.

Thus, the correct answer is option (3).