A patient develops glomerulonephritis and vasculitis following an infection, characterized by the deposition of antigen-antibody complexes in small blood vessels. This pathological process is characteristic of which type of hypersensitivity reaction?

✓ Correct Answer: Option C

Type III hypersensitivity reactions are caused by the formation and deposition of immune complexes (antigen-antibody complexes) in tissues, leading to complement activation and inflammation, as seen in conditions like glomerulonephritis or serum sickness.