**Core Concept**
Pemphigus is a group of autoimmune skin disorders characterized by the formation of blisters due to the breakdown of skin cell-cell adhesion. Acantholytic cells are a hallmark histopathological finding in Pemphigus, where keratinocytes detach from each other.

**Why the Correct Answer is Right**
Acantholytic cells in Pemphigus are derived from suprabasal keratinocytes. The autoantibodies in Pemphigus target desmoglein 3 and 1 proteins, which are components of desmosomes, the intercellular junctions that maintain keratinocyte adhesion. The antibodies disrupt these junctions, leading to keratinocyte detachment and the formation of acantholytic cells. This process is mediated by the activation of proteases, such as calpains, which cleave the cytoskeleton and disrupt cell-cell adhesion.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because acantholytic cells are not derived from basal keratinocytes, which are the deepest layer of the epidermis and not typically involved in the pathogenesis of Pemphigus.

**Option B:** This option is incorrect because melanocytes are skin cells responsible for producing melanin, and are not directly involved in the formation of acantholytic cells in Pemphigus.

**Option C:** This option is incorrect because Langerhans cells are a type of immune cell found in the epidermis, but they are not the source of acantholytic cells in Pemphigus.

**Clinical Pearl / High-Yield Fact**
The presence of acantholytic cells in a skin biopsy is a key diagnostic feature of Pemphigus, and can be used to differentiate it from other blistering skin disorders.

**Correct Answer:** D. Suprabasal keratinocytes.