**Core Concept**
A Type I Lepra reaction, also known as reversal reaction, is a clinical condition that occurs in the context of leprosy, particularly in borderline leprosy. It is characterized by an increase in cell-mediated immunity against the leprosy bacillus, leading to inflammation and damage to the nerves and skin.

**Why the Correct Answer is Right**
The Type I Lepra reaction is an example of a **Type III hypersensitivity reaction**, also known as immune complex-mediated hypersensitivity. This type of reaction occurs when antibodies and immune complexes deposit in the tissues, triggering an inflammatory response. In the context of leprosy, the immune complexes are formed against the leprosy bacillus, leading to the activation of macrophages and the release of various cytokines and chemokines, which contribute to the inflammation and tissue damage.

**Why Each Wrong Option is Incorrect**
* **Option A:** This option is incorrect because a Type I Lepra reaction is not an example of a Type I hypersensitivity reaction, which is mediated by IgE antibodies and involves the release of histamine from mast cells.
* **Option B:** This option is incorrect because a Type I Lepra reaction is not an example of a Type II hypersensitivity reaction, which is mediated by antibodies that bind to cell surface antigens and trigger cell damage.
* **Option C:** This option is incorrect because a Type I Lepra reaction is not an example of a Type IV hypersensitivity reaction, which is mediated by T cells and involves the release of cytokines and the activation of macrophages.

**Clinical Pearl / High-Yield Fact**
A key clinical feature of a Type I Lepra reaction is the presence of **erythema nodosum leprosum (ENL)**, a condition characterized by the formation of tender nodules on the skin, which can be accompanied by fever, malaise, and joint pain.

**Correct Answer:** C.