Which of the following is an example of a hypersensitivity reaction caused by immune complex formation?

Explanation

Immune complex hypersensitivity, also known as Type III hypersensitivity, involves the formation of antigen-antibody complexes that deposit in tissues, causing inflammation. Serum sickness is a classic example of this reaction, whereas atopic allergies, transfusion reactions, and contact dermatitis involve different hypersensitivity mechanisms.