This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Dental
Dyskeratosis is seen in: 
Select and explain. 
A. Pemphigus vulgaris, B. Bullous Pemphigoid, C. Darier's disease, D. Hailey-Hailey disease
C: Darier's disease
Answer: C: Darier's disease 
Explanation: Darier's disease is characterized by defect in Ca+2 pump that is necessary for desmosome function, due to mutation in ATP2A2 gene.
Both HHD and Darier's disease are characterized by acantholysis and suprabasal blister, but dysteratosis (premature keratinization in epidermis) is seen classically with Darier's disease.