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': "All of the following are true about Darier's disease except: \nSelect and explain. \nA. Defect in calcium ATPase because of mutation in ATP2A2 gene, B. Corps ronds and corps grains are seen, C. Subepidermal blister, D. V-shaped nicking of nail is present", 'role': 'user'}, {'content': "Answer: C \nExplanation: Both Hailey Hailey disease and Darier's disease are characterized by suprabasal acantholysis / suprabasal blister.", 'role': 'assistant'}]