Which of the following is an example of Type III hypersensitivity reaction
**Core Concept**
Type III hypersensitivity reactions involve the formation of antigen-antibody complexes that deposit in tissues, leading to inflammation and tissue damage. This reaction is mediated by the **complement system** and involves the activation of **immune cells**. The underlying principle is the formation of **immune complexes**.
**Why the Correct Answer is Right**
Although the options are missing, a classic example of a Type III hypersensitivity reaction is the **Arthus reaction**, where immune complexes form in the skin, leading to localized inflammation. Another example is **Systemic Lupus Erythematosus (SLE)**, where immune complexes deposit in various tissues, including the kidneys and joints. The **complement system** plays a crucial role in this reaction.
**Why Each Wrong Option is Incorrect**
**Option A:** Would be incorrect if it described a Type I or Type II hypersensitivity reaction.
**Option B:** Would be incorrect if it described a cell-mediated immune response.
**Option C:** Would be incorrect if it described a non-immune mediated reaction.
**Clinical Pearl / High-Yield Fact**
Type III hypersensitivity reactions can lead to significant tissue damage and are often associated with **autoimmune diseases**. Remembering the **Arthus reaction** and **SLE** as examples can help in identifying this type of reaction.
**Correct Answer:** D. Systemic Lupus Erythematosus (SLE)