**Core Concept**
Acantholysis is a process in which there is a loss of intercellular connections between keratinocytes, leading to the separation of these cells from one another. This phenomenon is a hallmark of certain skin disorders and is mediated by the disruption of desmosomal junctions, which are critical for maintaining the integrity of the epidermis.

**Why the Correct Answer is Right**
Acantholysis is most commonly associated with pemphigus vulgaris, an autoimmune disease characterized by the production of autoantibodies against desmoglein 3, a key component of desmosomal junctions. The binding of these autoantibodies to desmoglein 3 leads to the disruption of intercellular connections, resulting in acantholysis and the formation of intraepidermal blisters. This process is mediated by the activation of proteases, such as matrix metalloproteinases, which contribute to the degradation of the desmosomal junctions.

**Why Each Wrong Option is Incorrect**
**Option A:** Psoriasis is a chronic skin disorder characterized by an abnormal immune response and the formation of thick, scaly plaques. While psoriasis involves changes in the epidermis, it is not typically associated with acantholysis.

**Option B:** Eczema, or atopic dermatitis, is a chronic inflammatory skin condition characterized by dry, itchy skin and the formation of small, raised bumps. Acantholysis is not a characteristic feature of eczema.

**Option C:** Lichen planus is a chronic inflammatory skin condition characterized by the formation of purplish, itchy papules and plaques. While lichen planus involves changes in the epidermis, it is not typically associated with acantholysis.

**Clinical Pearl / High-Yield Fact**
Acantholysis is a key feature of pemphigus vulgaris, and the presence of intraepidermal blisters should raise suspicion for this disorder. In addition, the presence of autoantibodies against desmoglein 3 can be detected using immunofluorescence or ELISA, which can help confirm the diagnosis.

**Correct Answer:** D. Pemphigus vulgaris.