Type 5 hypersensitivity reaction is modification of ?

**Core Concept**
Type 5 hypersensitivity reactions involve the deposition of immune complexes in various tissues, leading to inflammation and tissue damage. This type of reaction is often seen in conditions such as systemic lupus erythematosus (SLE) and rheumatoid arthritis. The immune complexes activate the complement system, leading to the release of anaphylatoxins and the recruitment of inflammatory cells.

**Why the Correct Answer is Right**
The correct answer is a modification of the Arthus reaction, a classic example of a Type 3 hypersensitivity reaction. In the Arthus reaction, immune complexes form in the skin and cause localized inflammation. However, in Type 5 hypersensitivity reactions, the immune complexes are deposited in deeper tissues, such as the kidneys or joints, leading to more severe and widespread inflammation. This is due to the increased size of the immune complexes, which are more likely to be deposited in these tissues.

**Why Each Wrong Option is Incorrect**
**Option A:** The correct answer is not a modification of the Anaphylactic reaction, as Type 5 hypersensitivity reactions do not involve the release of histamine from mast cells.
**Option B:** The correct answer is not a modification of the Cell-mediated hypersensitivity reaction, as Type 5 hypersensitivity reactions involve the activation of the complement system and the recruitment of inflammatory cells.
**Option C:** The correct answer is not a modification of the Antibody-dependent cellular cytotoxicity (ADCC) reaction, as Type 5 hypersensitivity reactions do not involve the activation of immune cells to destroy target cells.

**Clinical Pearl / High-Yield Fact**
It's essential to remember that Type 5 hypersensitivity reactions are often associated with conditions such as SLE and rheumatoid arthritis, and can be triggered by the deposition of immune complexes in various tissues. This can lead to inflammation and tissue damage, and can be treated with immunosuppressive medications.

**Correct Answer: D. The Arthus reaction.**