Ans: The immune response is the result of the attachment of antibodies to antigens. This is an immunogenic reaction where the immune system identifies an antigen. It means the antibodies can recognize pathogenic proteins. Due to this response, a message is sent to the immune system. The antibodies thus assist in finding pathogens and also promote phagocytosis. This step helps the WBCs to engulf and digest the pathogens present in the blood and protect our body from any pathogenic invasion.