What is the nature of the antibody-antigen interaction in rheumatoid arthritis?

Answer: Complex formation

Explanation:

Rheumatoid Arthritis is the condition in which the body's own immune system reacts with the own cells of the body considering as antigen.

The rheumatoid factor are the auto-anbodies that is produced from the immune system of the body. These antibodies binds to the Fc region of the IgG molecules.

There is a formation of complex that consists of the auto antibody and self antigen. This is the nature of interaction in case of rheumatoid arthritis.