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
Hailey - hailey disease is: 
Select and explain. 
A. Benign familial chronic pemphigus, B. Pemphigus acutus, C. Pemphigus, D. Lyell's syndrome
A: Benign familial chronic pemphigus
Answer: A: Benign familial chronic pemphigus 
Explanation: A. i.e. Benign Familial Chronic Pemphigus