Final Answer:
Insect bites (Option c) induce type III hypersensitivity reactions, involving immune complex formation and subsequent tissue damage. Unlike inhaled pollen (Option a), viral infections (Option b), or blood transfusions (Option d), the immune response in type III hypersensitivity is characterized by the deposition of immune complexes that trigger inflammation and harm surrounding tissues.
Step-by-step explanation:
Insect bites (Option c) induce type III hypersensitivity reactions, which involve the formation of immune complexes in the bloodstream. When antigens from insect saliva or venom combine with antibodies, immune complexes are formed. These complexes can deposit in various tissues, leading to an inflammatory response that damages surrounding cells and triggers symptoms.
Unlike inhaled pollen (Option a) causing allergic reactions, viral infections (Option b) provoking diverse immune responses, or blood transfusions (Option d) primarily associated with other types of hypersensitivity, type III hypersensitivity is characterized by the precipitation of immune complexes that contribute to inflammation and tissue injury. Understanding the triggers of different hypersensitivity reactions is crucial for diagnosing and managing immune-related disorders.