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
"Dilapidated brick wall appearance" is seen in 
Select and explain. 
A. Darier's disease, B. Pyrogenic granuloma, C. Hailey Hailey disease, D. Dyskeratosis congenita
C: Hailey Hailey disease
Answer: C: Hailey Hailey disease 
Explanation: Hailey Hailey disease is characterized by defect in calcium pump essential for desmosome function because of mutation in ATP2C1 gene.