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
[{'content': '"Dilapidated brick wall appearance" is seen in \nSelect and explain. \nA. Darier\'s disease, B. Pyrogenic granuloma, C. Hailey Hailey disease, D. Dyskeratosis congenita', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Hailey Hailey disease is characterized by defect in calcium pump essential for desmosome function because of mutation in ATP2C1 gene.', 'role': 'assistant'}]