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: Skin
The "dilapidated brick wall" appearance is classically seen in the histopathology of the following? 
Select and explain. 
A. Hailey Hailey disease, B. Pemphigus vulgaris, C. Darier's disease, D. Bullous pemphigoid
A: Hailey Hailey disease
Answer: A: Hailey Hailey disease 
Explanation: Hailey Hailey disease/familial benign chronic pemphigus has full thickness paial acantholysis resulting in this appearance. Ref: Rook Textbook of Dermatology, 8th Edition, Page 39.33.