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
[{'content': "Hailey - hailey disease is: \nSelect and explain. \nA. Benign familial chronic pemphigus, B. Pemphigus acutus, C. Pemphigus, D. Lyell's syndrome", 'role': 'user'}, {'content': 'Answer: A \nExplanation: A. i.e. Benign Familial Chronic Pemphigus', 'role': 'assistant'}]